Collection
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In common usage, a collection is any group of items that has one or more properties in common. For example, paintings from the same artist, or coins from Germany before 1900, see collecting and collectible.
In mathematics, collection isn't precisely defined, but can refer to various objects. Most often it refers to a set, class, family, or multiset.
In music, specifically diatonic set theory, a collection is similar to a set, see generated collection.
See also Collection (Oxford Colleges)