- Bengali Word অ ১English definition(noun) the written form of the first vowel sound and 1st letter of the Bengali alphabet. Unlike other vowels অ has no shortened sign (like া ি ী). অ-আ, অ-আ-ক-খ (noun(s)) (1) the letters of the Bengali alphabet. (2) elementary knowledge; the rudiments of learning; ABC: ব্যাকরণের অ-আ-ক-খ.