types:

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agglomeration

the act of collecting in a mass; the act of agglomerating

collation

assembling in proper numerical or logical sequence

compilation, compiling

the act of compiling (as into a single book or file or list)

gather, gathering

the act of gathering something

bottle collection

the activity of collecting bottles

conchology, shell collecting

the collection and study of mollusc shells

coin collecting, coin collection, numismatics, numismatology

the collection and study of money (and coins in particular)

pickup

the act or process of picking up or collecting from various places

philately, stamp collecting, stamp collection

the collection and study of postage stamps

tax collection

the collection of taxes

centralisation, centralization

gathering to a center

harvest, harvest home, harvesting

the gathering of a ripened crop

garbage collection, garbage pickup, trash collection, trash pickup

the collection and removal of garbage

aerophilately

the collection and study of airmail stamps

type of:

grouping

the activity of putting things together in groups