A vs. While

A, or a, is the first letter and the first vowel letter of the modern English alphabet and the ISO basic Latin alphabet. Its name in English is a (pronounced ), plural aes.

While is a word in the English language that functions both as a noun and as a subordinating conjunction. Its meaning varies largely based on its intended function, position in the phrase and even the writer or speaker's regional dialect.

used when mentioning someone or something for the first time in a text or conversation

A period of time

used to indicate membership of a class of people or things

The time, effort, or trouble taken in doing something

in, to, or for each; per (used when expressing rates or ratios)

As long as; during the time that

the first letter of the alphabet.

In spite of the fact that; although

a shape like that of a capital A

And on the contrary

the sixth note of the diatonic scale of C major. The A above middle C is usually used as the basis for tuning and in modern music has a standard frequency of 440 Hz.

To spend (time) idly or pleasantly

The first letter of the modern English alphabet.

An uncertain duration of time, a period of time.

Any of the speech sounds represented by the letter a.

(US) an uncertain long period of time

The first in a series.

(Philippines) an uncertain short moment

Something shaped like the letter A.

During the same time that.

A The best or highest in quality or rank

Although.

The sixth tone in the scale of C major or the first tone in the relative minor scale.

Until.

A key or scale in which A is the tonic.

As long as.

A written or printed note representing this tone.

Until.

A string, key, or pipe tuned to the pitch of this tone.

To pass (time) idly.

A One of the four major blood groups in the ABO system. Individuals with this blood group have the A antigen on the surface of their red blood cells, and the anti-B antibody in their blood serum.

(transitive) To occupy or entertain (someone) in order to let time pass.

In every; to each; per

To elapse, to pass.

To do with separation; In, into.

Alternative spelling or misspelling of wile.

To do with time; Each, per, in, on, by.

Space of time, or continued duration, esp. when short; a time; as, one while we thought him innocent.

To do with status; In.

That which requires time; labor; pains.

(archaic) To do with position or direction; In, on, at, by, towards, onto.

To cause to pass away pleasantly or without irksomeness or disgust; to spend or pass; - usually followed by away.

(archaic) To do with process, with a passive verb; In the course of, experiencing.

To loiter.

(archaic) To do with an action, an active verb; Engaged in.

During the time that; as long as; whilst; at the same time that; as, while I write, you sleep.

(archaic) To do with an action/movement; To, into.

Hence, under which circumstances; in which case; though; whereas.

(obsolete) To do with method; In, with.

Until; till.

(obsolete) To do with role or capacity; In.

a period of indeterminate length (usually short) marked by some action or condition;

Of.

Have.

He, or sometimes she, it. en

All.

All.

The first letter of the English and of many other alphabets. The capital A of the alphabets of Middle and Western Europe, as also the small letter (a), besides the forms in Italic, black letter, etc., are all descended from the old Latin A, which was borrowed from the Greek Alpha, of the same form; and this was made from the first letter ( ) of the Phœnician alphabet, the equivalent of the Hebrew Aleph, and itself from the Egyptian origin. The Aleph was a consonant letter, with a guttural breath sound that was not an element of Greek articulation; and the Greeks took it to represent their vowel Alpha with the ä sound, the Phœnician alphabet having no vowel symbols.

The name of the sixth tone in the model major scale (that in C), or the first tone of the minor scale, which is named after it the scale in A minor. The second string of the violin is tuned to the A in the treble staff. - A sharp (A$) is the name of a musical tone intermediate between A and B. - A flat (A$) is the name of a tone intermediate between A and G.

An adjective, commonly called the indefinite article, and signifying one or any, but less emphatically.

In each; to or for each; as, "twenty leagues a day", "a hundred pounds a year", "a dollar a yard", etc.

Of.

A barbarous corruption of have, of he, and sometimes of it and of they.

An expletive, void of sense, to fill up the meter

In; on; at; by.

In process of; in the act of; into; to; - used with verbal substantives in -ing which begin with a consonant. This is a shortened form of the preposition an (which was used before the vowel sound); as in a hunting, a building, a begging.

the blood group whose red cells carry the A antigen

a metric unit of length equal to one ten billionth of a meter (or 0.0001 micron); used to specify wavelengths of electromagnetic radiation

any of several fat-soluble vitamins essential for normal vision; prevents night blindness or inflammation or dryness of the eyes

one of the four nucleotides used in building DNA; all four nucleotides have a common phosphate group and a sugar (ribose)

(biochemistry) purine base found in DNA and RNA; pairs with thymine in DNA and with uracil in RNA

the basic unit of electric current adopted under the Systeme International d'Unites;

the 1st letter of the Roman alphabet