1) (an instance of) the process of collecting something (accumulation)
2) the act of gaining or collecting (acquisition)
3) enjoying, in the habit of, buying or collecting more and more things (acquisitive)
4) a book used for collecting photographs, postage stamps etc (album)
5) (an instance of) collecting things (collection)
(an instance of) the process of collecting something
gathering or amassing
(a result of) compiling
assemblage