Meaning of ASSOCIATIVE in English

■ adjective

1》 of or involving association.

2》 Mathematics involving the condition that a group of quantities connected by operators gives the same result in whichever order the operations are performed, as long as the order of the quantities remains the same, e.g. ( a × b ) × c = a × ( b × c ).

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.