词是在一组形式之下的共同要素，是词汇的单位，是一个词条，或是一个词位。
Word is the common factor underlying a set of forms, a unit of vocabulary, a lexical item, or a lexeme.
词位被假定为语言词汇系统中潜在于最小单位之下的抽象单位，而最小单位是在不同的语法环境中出现的。
Lexeme — is postulated as the abstract unit underlying the smallest unit in the lexical system of a language, which appears in different grammatical contexts.
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