The hiragana syllable あ (a). Its equivalent in katakana is ア (a). It is the first syllable in the gojūon order; its position is あ行あ段 (a-gyō a-dan, “row a, section a”).

expresses surprise: Ah! Oh! / used to get someone's attention / used as a response to someone's call

(obsolete) first-person personal pronoun: I, me

distal demonstrative, something far off removed from both speaker and listener: that, yon

(obsolete) foot

(obsolete) ridge between rice fields; ridge between groves

(Classical Japanese) to be, to exist

expresses surprise / expresses affirmation / used to call attention / expresses a grunt or pain / (colloquial) expresses a calm positive response: yeah

ah

ah / oh / yeah, yes