1 the first letter in the Greek alphabet (A, ) 希腊语字母表的第一个字母（A, ）.
2 (idm 习语) ,Alpha and `Omega the beginning and the end 始终; 首尾.
n [C usually singular]
[Date: 1200-1300; Language: Latin;Origin:Greek]
the first letter of the Greek alphabet
the alpha and omega
formal the start and finish of something, and therefore the whole of it
Collective bargaining was viewed as the alpha and omega of trade unionism.