Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
association [əsəusɪˈeɪʃən] n (group, PSYCH) ассоциа́ция; (involvement) связь*f
in association with в сотру́дничестве с +instr
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.