Diurnal vs. Day — What's the Difference?

Relating to or occurring in a 24-hour period; daily.

A day is approximately the period during which the Earth completes one rotation around its axis, which takes around 24 hours. A solar day is the length of time which elapses between the Sun reaching its highest point in the sky two consecutive times.

Occurring or active during the daytime rather than at night

The period of light between dawn and nightfall; the interval from sunrise to sunset.

(Botany) Opening during daylight hours and closing at night.

The 24-hour period during which the earth completes one rotation on its axis, traditionally measured from midnight to midnight.

A book containing all the offices for the daily canonical hours of prayer except matins.

The period during which a celestial body makes a similar rotation.

A diary or journal.

One of the numbered 24-hour periods into which a week, month, or year is divided.

A daily newspaper.

The portion of a 24-hour period that is devoted to work, school, or business

Happening or occurring during daylight, or primarily active during that time.

A 24-hour period or a portion of it that is reserved for a certain activity

(botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night.

A specific, characteristic period in one's lifetime

Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset; circadian.

A period of opportunity or prominence

(uncommon) Done once every day; daily, quotidian.

A period of time in history; an era

(archaic) Published daily.

Days Period of life or activity

A flower that opens only in the day.

Of or relating to the day.

(Catholicism) A book containing canonical offices performed during the day, hence not matins.

Working during the day

(archaic) A diary or journal.

Occurring before nightfall

(archaic) A daily news publication.

Any period of 24 hours.

Relating to the daytime; belonging to the period of daylight, distinguished from the night; - opposed to nocturnal; as, diurnal heat; diurnal hours.

A 24-hour period beginning at 6am or sunrise.

Daily; recurring every day; performed in a day; going through its changes in a day; constituting the measure of a day; as, a diurnal fever; a diurnal task; diurnal aberration, or diurnal parallax; the diurnal revolution of the earth.

A period from midnight to the following midnight.

Opening during the day, and closing at night; - said of flowers or leaves.

(astronomy) Rotational period of a planet (especially Earth).

Active by day; - applied especially to the eagles and hawks among raptorial birds, and to butterflies (Diurna) among insects.

The part of a day period which one spends at one’s job, school, etc.

A daybook; a journal.

Part of a day period between sunrise and sunset where one enjoys daylight; daytime.

A small volume containing the daily service for the "little hours," viz., prime, tierce, sext, nones, vespers, and compline.

A specified time or period; time, considered with reference to the existence or prominence of a person or thing; age; time; era#Noun.

A diurnal bird or insect.

A period of contention of a day or less.

Belonging to or active during the day;

(Judaism) A time period from a nightfall until the following nightfall

Having a daily cycle or occurring every day;

To spend a day (in a place).

The time of light, or interval between one night and the next; the time between sunrise and sunset, or from dawn to darkness; hence, the light; sunshine; - also called daytime.

The period of the earth's revolution on its axis. - ordinarily divided into twenty-four hours. It is measured by the interval between two successive transits of a celestial body over the same meridian, and takes a specific name from that of the body. Thus, if this is the sun, the day (the interval between two successive transits of the sun's center over the same meridian) is called a solar day; if it is a star, a sidereal day; if it is the moon, a lunar day. See Civil day, Sidereal day, below.

Those hours, or the daily recurring period, allotted by usage or law for work.

A specified time or period; time, considered with reference to the existence or prominence of a person or thing; age; time.

Preceded by the) Some day in particular, as some day of contest, some anniversary, etc.

Time for Earth to make a complete rotation on its axis;

Some point or period in time;

The time after sunrise and before sunset while it is light outside;

A day assigned to a particular purpose or observance;

The recurring hours when you are not sleeping (especially those when you are working);

An era of existence or influence;

A period of opportunity;

The period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis;

The time for one complete rotation of the earth relative to a particular star, about 4 minutes shorter than a mean solar day

United States writer best known for his autobiographical works (1874-1935)