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Morpheme

From Biocrawler, the free encyclopedia.

In linguistics, a morpheme is the smallest language unit that carries a semantic interpretation. Morphemes are, generally, a distinctive collocation of phonemes (as the free form pin or the bound form -s of pins) having no smaller meaningful members.

English example: The word "unbelievable" has three morphemes "un-", (negatory) a bound morpheme, "-believe-" a free morpheme, and "-able". "un-" is also a prefix, "-able" is a suffix. Both are affixes.

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Types of morphemes

Free morphemes like town, dog can appear with other lexemes (as in town-hall or dog-house) or they can stand alone, or "free". Allomorphs are variants of a morpheme, e.g. the plural marker in English is sometimes realized as /-z/, /-s/ or /-Iz/.
Bound morphemes like "un-" appear only together with other morphemes to form a lexeme. Bound morphemes in general tend to be prefixes and suffixes.
Inflectional morphemes modify a word's tense, number, aspect, and so on.
Derivational morphemes can be added to a word to create (derive) another word: the addition of "-ness" to "happy", for example, to give "happiness".

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