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Word
In linguistics, a word is the smallest element that may be uttered in isolation with semantic or pragmatic content (with literal or practical meaning). This contrasts deeply with a morpheme, which is the smallest unit of meaning but will not necessarily stand on its own. A word may consist of a single morpheme (for example: ''oh!, rock, red, quick, run, expect''), or several (''rocks, redness, quickly, running, unexpected''), whereas a morpheme may not be able to stand on its own as a word (in the words just mentioned, these are ''-s, -ness, -ly, -ing, un-, -ed'').
A complex word will typically include a root and one or more affixes (''rock-s, red-ness, quick-ly, run-ning, un-expect-ed''), or more than one root in a compound (''black-board, rat-race''). Words can be put together to build larger elements of language, such as phrases (''a red rock''), clauses (''I threw a rock''), and sentences (''He threw a rock too, but he missed'').
The term ''word'' may refer to a spoken word or to a written word, or sometimes to the abstract concept behind either. Spoken words are made up of units of sound called phonemes, and written words of symbols called graphemes, such as the letters of the English alphabet.
==Definitions==
The ease or difficulty of deciphering a word depends on the language. Dictionaries categorize a language's lexicon (i.e., its vocabulary) into lemmas. These can be taken as an indication of what constitutes a "word" in the opinion of the writers of that language.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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