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From Middle English and Old English upper case letter A and split of Middle English and Old English upper case letter Æ. * The Old English letters A and Æ replaced the Anglo-Saxon Futhorc letters ᚪ (a, “āc”) and ᚫ (æ, “æsc”), derived from the Runic letter ᚫ (a, “Ansuz”), in the 7th century.

* (highest rank, grade, music): From the initial position of the letter A in the English alphabet. * (blood type): From A antigen

The letter name is from Middle English ā, from Old French, ultimately from Latin ā. Use of the Latin letter in (Old) English displaced the futhorc letter ᚪ (a) beginning in the 7th century, and partially also ᚫ (æ).

Etymology tree Proto-Indo-European *ís? Proto-Indo-European *h₁óynos Proto-Germanic *ainaz Proto-West Germanic *ain Old English ān Middle English an Middle English a English a From Middle English a, an, from Old English ān (“one; a; lone; sole”). More at one. The "n" was gradually lost before consonants in almost all dialects by the 15th century. Cognate with Alemannic German a (“a, an”), East Franconian a (“a, an”).

* From Middle English a, o, from Old English a-, an, on. * Unstressed form of on.

From Middle English a, ha contraction of have, or haven.

From Middle English a, a reduced form of he (“he”)/ha (“he”), heo (“she”)/ha (“she”), ha (“it”), and hie, hie (“they”).

Etymology tree Proto-Indo-European *h₂ep Proto-Indo-European *-o Proto-Indo-European *h₂epó Proto-Germanic *ab Proto-West Germanic *ab Old English æf Old English of Middle English of English a From Middle English of, with apocope of the final f and vowel reduction.

From Northern Middle English aw, alteration of all.

Contraction of gonna, itself a reduction of going to; see Etymology 8 above (“to”).

Contraction of and.

Borrowed from Russian а (a).

From the common method of counting semiquavers as "one-e-and-a, two-e-and-a" and so on, so forth.