Definition of grammar
1a : the study of the classes of words, their inflections (see inflection sense 2), and their functions and relations in the sentence
b : a study of what is to be preferred and what avoided in inflection (see inflection sense 2) and syntax (see syntax sense 1)
2a : the characteristic system of inflections (see inflection sense 2) and syntax of a language
b : a system of rules that defines the grammatical structure of a language
3a : a grammar textbook
b : speech or writing evaluated according to its conformity to grammatical rules
appalled at the bad grammar of college students
4 : the principles or rules of an art, science, or technique
a grammar of the theater also : a set of such principles or rules
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The first known use of grammar was in the 14th century
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