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According to linguistic study, a morpheme is the smallest meaningful unit in a given language. This is the definition established in 1933 by the American linguist Leonard Bloomfield.

English Example: The word "unbelievable" has three morphemes "un-", a bound morpheme, meaning "non-", "-believe-" a free morpheme, and "-able". "un-" is also a prefix, "-able" is a suffix. Both are affixes.

Types of morphemes:

See also: Morphology, Morphophonology, Morphological analysis, Lemmata