Meaning of ALPHA in English

al ‧ pha /ˈælfə/ BrE AmE noun [countable usually singular]

[ Date: 1200-1300 ; Language: Latin ; Origin: Greek ]

1 . the first letter of the Greek alphabet

2 . 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.

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.