Webster's English Dictionary

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grammar

gram.mar \'gram-*r\ \gr*-'mer-e--*n, -'mar-\ n [ME gramere, fr. MF 
   gramaire, modif. of L grammatica, fr. Gk]grammatike-, fr. fem. of 
   grammatikos of letters, fr. grammat-, gramma 1a: the study of the classes 
   of words, their inflections, and their functio ns and relations in the 
   sentence 1b: a study of what is to be preferred and what avoided in 
   inflection and s yntax 2: the phenomena of language with which grammar 
   deals  3a: a grammar textbook  3b: speech or writing evaluated according to 
   its conformity to grammatical  rules 4: the principles or rules of an art, 
   science, or technique  - gram.mar.i.an n