A word is a unit of language that carries meaning and consists of one or more morphemes which are linked more or less tightly together. Typically a word will consist of a root or stem and zero or more affixes. Words can be combined to create phrases, clauses and sentences. A word consisting of two or more stems joined together is called a compound.

Difficulty in defining the term

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The precise definition of what a word is depends on which language the definition is for, and the dividing line between words and phrases is not always clear. In most writing systems, a word is usually marked out in the text by interword separation such as spaces or word dividers used in some languages such as Amharic. In other languages such as Chinese and Japanese, and in many ancient languages such as Sanskrit, word boundaries are not shown.

Even in writing systems that use interword separation, word boundaries are not always clear; for example, even though ice cream is written like two words, it is a single compound because it cannot be separated by another morpheme or rephrased like iced cream or cream of ice. Likewise, a proper noun is a word, however long it is. A space may not be even the main morpheme boundary in a word; the word New Yorker is a compound of New York and -er, not of New and Yorker. In English, many common words have historically progressed from being written as two separate words (e.g. to day) to hyphenated (to-day) to a single word (today), a process which is still ongoing, as in the common spelling of all right as alright.

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