Meaning of BASIS in English

n. (pl. bases) 1 the foundation or support of something, esp. an idea or argument. 2 the main or determining principle or ingredient (on a purely friendly basis). 3 the starting-point for a discussion etc.

[ L f. Gk, = BASE(1) ]

Concise Oxford English dictionary.      Краткий оксфордский словарь английского языка.