The definition of collectible is able to be brought together into a series.
(adjective)An example of collectible used as an adjective is the phrase collectible coins which means coins that people collect.
A collectible is defined as one of a group of objects that people collect.
(noun)An example of a collectible is the stuffed toy called a Beanie Baby.
See collectible in Webster's New World College Dictionary
or collectable
adjective
noun
See collectible in American Heritage Dictionary 4
also col·lect·a·ble
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