Double vs. Twin — What's the Difference?

Consisting of two equal, identical, or similar parts or things

Twins are two offspring produced by the same pregnancy. Twins can be either monozygotic ('identical'), meaning that they develop from one zygote, which splits and forms two embryos, or dizygotic ('non-identical' or 'fraternal'), meaning that each twin develops from a separate egg and each egg is fertilized by its own sperm cell.

Lower in pitch by an octave.

One of two offspring born at the same birth.

At or to twice the amount or extent

One of two identical or similar people, animals, or things; a counterpart.

A thing which is twice as large as usual or is made up of two standard units or things

Twins(Mineralogy) Two interwoven crystals that are mirror images of each other.

A person who looks exactly like another

A twin bed.

(especially in tennis and badminton) a game or competition involving sides made up of two players

Being two or one of two offspring born at the same birth

A system of change-ringing using five bells, with two pairs changing places each time.

Being two or one of two identical or similar people, animals, or things

A pair of victories in the same sport in two different competitions

(Botany) Of or relating to structures, such as flowers, that occur in pairs.

A number or amount which is twice as large as a contrasting or usual number or amount

Consisting of two identical or similar parts

Become twice as much or as many

Being of a size that will fit a twin bed

Fold or bend (paper, cloth, or other material) over on itself

To give birth to twins.

Be used in or play another, different role

(Archaic) To be one of twin offspring.

Twice as much in size, strength, number, or amount

To be paired or coupled.

Composed of two like parts

To pair or couple.

Composed of two unlike parts; dual

To provide a match or counterpart to.

Accommodating or designed for two

Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.

Characterized by duplicity; deceitful

Either of two similar or closely related objects, entities etc.

(Botany) Having many more than the usual number of petals, usually in a crowded or an overlapping arrangement

A room in a hotel, guesthouse, etc. with two beds; a twin room.

Something increased twofold.

(US) A twin size mattress or a bed designed for such a mattress.

One that closely resembles another; a duplicate.

(aviation) A two-engine aircraft.

Something having two identifiable or prominent parts or members.

(crystallography) A twin crystal.

Something capable of carrying, moving, or holding two people or things, as a mattress.

To separate, divide.

An actor's understudy.

To split, part; to go away, depart.

An actor who takes the place of another actor in scenes requiring special skills or preparations

(usually in the passive) To join, unite; to form links between (now especially of two places in different countries); to pair with.

An apparition; a wraith.

(intransitive) To give birth to twins.

A sharp turn in a direction of movement; a reversal.

(transitive) To be, or be like, a twin to (someone else); to match in some way.

A sharp, often devious change in position or argument; a shift.

(intransitive) To be, or be like, a pair of twins (for example, to dress identically); to be paired or suited.

Doubles(Sports) A form of a game, such as tennis or handball, having two players on each side.

Double; dual; occurring as a matching pair.

(Baseball) A hit enabling the batter to reach second base. Also called two-bagger, two-base hit.

Forming a pair of twins.

A bid in bridge indicating strength to one's partner; a request for a bid.

Being one of two born at a birth; as, a twin brother or sister.

A bid doubling one's opponent's bid in bridge, thus increasing the penalty for failure to fulfill the contract.

Being one of a pair much resembling one another; standing in the relation of a twin to something else; - often followed by to or with.

A hand justifying such a bid.

Double; consisting of two similar and corresponding parts.

To make twice as great.

One of two produced at a birth, especially by an animal that ordinarily brings forth but one at a birth; - used chiefly in the plural, and applied to the young of beasts as well as to human young.

To be twice as much as

A sign and constellation of the zodiac; Gemini. See Gemini.

To fold in two.

A person or thing that closely resembles another.

To clench (one's fist).

A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.

To duplicate; repeat.

To bring forth twins.

To turn (an enemy spy) into a double agent.

To be born at the same birth.

To cause the scoring of (a run) by hitting a double.

To cause to be twins, or like twins in any way.

To advance or score (a runner) by hitting a double.

To separate into two parts; to part; to divide; hence, to remove; also, to strip; to rob.

To put out (a runner) as the second part of a double play.

To depart from a place or thing.

(Games) To challenge (an opponent's bid) with a double in bridge.

Either of two offspring born at the same time from the same pregnancy

(Music) To duplicate (another part or voice) an octave higher or lower or in unison.

(astrology) a person who is born while the sun in in Gemini

(Nautical) To sail around

A waterfall in the Snake River in southern Idaho

To be increased twofold

A duplicate copy

To turn sharply or all the way around; reverse one's course

Duplicate or match;

To serve in an additional capacity

Bring two objects, ideas, or people together;

To replace an actor in the actor's absence or in a certain scene.

Grow as twins;

(Baseball) To hit a double.

Give birth to twins

(Games) To announce a double in bridge.

Being two identical

To twice the amount or extent; doubly

Very similar

Two together; in pairs

In two

Made up of two matching or complementary elements.

Of twice the quantity.

Of a family relationship, related on both the maternal and paternal sides of a family.

Designed for two users.

Folded in two; composed of two layers.

Stooping; bent over.

Having two aspects; ambiguous.

False, deceitful, or hypocritical.

Of flowers, having more than the normal number of petals.

(music) Of an instrument, sounding an octave lower.

(music) Of time, twice as fast.

Twice over; twofold; doubly.

Two together; two at a time. (especially in see double)

Twice the number, amount, size, etc.

A person who resembles and stands in for another person, often for safety purposes

A drink with two portions of alcohol.

A ghostly apparition of a living person; a doppelgänger.

A sharp turn, especially a return on one's own tracks.

A redundant item for which an identical item already exists.

(baseball) A two-base hit.

(bridge) A call that increases certain scoring points if the last preceding bid becomes the contract.

(billiards) A strike in which the object ball is struck so as to make it rebound against the cushion to an opposite pocket.

A bet on two horses in different races in which any winnings from the first race are placed on the horse in the later race.

(darts) The narrow outermost ring on a dartboard.

(darts) A hit on this ring.

(dominoes) A tile that has the same value (i.e., the same number of pips) on both sides.

A double-precision floating-point number.

(soccer) Two competitions, usually one league and one cup, won by the same team in a single season.

(rowing) A boat for two scullers.

(sports) The feat of scoring twice in one game.

The feat of winning two events in a single meet or competition.

(historical) A former French coin worth one-sixth of a sou.

A copper coin worth one-eighth of a penny.

(music) Playing the same part on two instruments, alternately.

(Christianity) A double feast.

Synonym of double-quick

(transitive) To multiply by two.

(intransitive) To increase by 100%, to become twice as large in size.

To be the double of; to exceed by twofold; to contain or be worth twice as much as.

(transitive) To fold over so as to make two folds.

(transitive) (sometimes followed by up) To clench (a fist).

(baseball) To get a two-base hit.

(transitive) (often followed by together or up) To join or couple.

(transitive) To repeat exactly; copy.

To serve a second role or have a second purpose.

To act as substitute for (another theatrical performer in a certain role, etc).

(theatre) To play (both one part and another, in the same play, etc).

(intransitive) To turn sharply, following a winding course.

(nautical) To sail around (a headland or other point).

(music) To duplicate (a part) either in unison or at the octave above or below it.

To be capable of performing (upon an additional instrument).

(bridge) To make a call that will double certain scoring points if the preceding bid becomes the contract.

To double down.

To cause (a ball) to rebound from a cushion before entering the pocket.

(intransitive) To go or march at twice the normal speed.

(transitive) To multiply the strength or effect of by two.

(military) To unite, as ranks or files, so as to form one from each two.

To transmit simultaneously on the same channel as another station, either unintentionally or deliberately, causing interference.

To operate as a double agent.

Twofold; multiplied by two; increased by its equivalent; made twice as large or as much, etc.

Being in pairs; presenting two of a kind, or two in a set together; coupled.

Divided into two; acting two parts, one openly and the other secretly; equivocal; deceitful; insincere.

Having the petals in a flower considerably increased beyond the natural number, usually as the result of cultivation and the expense of the stamens, or stamens and pistils. The white water lily and some other plants have their blossoms naturally double.

Twice; doubly.

To increase by adding an equal number, quantity, length, value, or the like; multiply by two; as, to double a sum of money; to double a number, or length.

To make of two thicknesses or folds by turning or bending together in the middle; to fold one part upon another part of; as, to double the leaf of a book, and the like; to clinch, as the fist; - often followed by up; as, to double up a sheet of paper or cloth.

To be the double of; to exceed by twofold; to contain or be worth twice as much as.

To pass around or by; to march or sail round, so as to reverse the direction of motion.

To unite, as ranks or files, so as to form one from each two.

To be increased to twice the sum, number, quantity, length, or value; to increase or grow to twice as much.

To return upon one's track; to turn and go back over the same ground, or in an opposite direction.

To play tricks; to use sleights; to play false.

To set up a word or words a second time by mistake; to make a doublet.

Twice as much; twice the number, sum, quantity, length, value, and the like.

Among compositors, a doublet (see Doublet, 2.); among pressmen, a sheet that is twice pulled, and blurred.

That which is doubled over or together; a doubling; a plait; a fold.

A turn or circuit in running to escape pursues; hence, a trick; a shift; an artifice.

A person or thing that is the counterpart of another; a duplicate; copy; (Obs.) transcript; - now chiefly used of persons. Hence, a wraith.

A player or singer who prepares to take the part of another player in his absence; a substitute; - used especially of a person who resembles an actor and takes the actor's place in scenes requiring special skills; as, a stunt double.

Double beer; strong beer.

A feast in which the antiphon is doubled, hat is, said twice, before and after the Psalms, instead of only half being said, as in simple feasts.

A game between two pairs of players; as, a first prize for doubles.

An old term for a variation, as in Bach's Suites.

A base hit on which the batter stops safely at second base;

A stand-in for movie stars to perform dangerous stunts;

Someone who closely resembles a famous person (especially an actor);

A quantity that is twice as great as another;

Raising the stakes in a card game by a factor of 2;

Increase twofold;

Hit a two-base hit

Bend over or curl up, usually with laughter or pain;

Do double duty; serve two purposes or have two functions;

Bridge: make a demand for (a card or suit)

Make or do or perform again;

Having more than one decidedly dissimilar aspects or qualities;

Consisting of or involving two parts or components usually in pairs;

Twice as great or many;

Used of flowers having more than the usual number of petals in crowded or overlapping arrangements;

Used of homologous chromosomes associated in pairs in synapsis

Large enough for two;

Having two meanings with intent to deceive;

Downward and forward;

Two together;

To double the degree;