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lexical base term

Lexical base terms are words or list of words, which form a lexical base for a number of keywords or words, which have got the same meaning. There is no clear definition what the lexical base term for a keyword might be, since this depends much from the context of the application.

'maintain' could be the lexical base for

  maintain, maintained, maintains, maintenance

'maintenance' could also refer to a different lexical base term