grammar Definition in the Cambridge English Dictionary
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Definition of “grammar” - English Dictionary

Definition of "grammar" - American English Dictionary

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grammarnoun [U]

 us   /ˈɡræm·ər/
grammar the ​study or use of the ​rules about how words ​changetheirform and ​combine with other words to ​expressmeaning: She ​memorized the ​vocabulary but is having ​trouble with the grammar.
(Definition of grammar from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "grammar" - British English Dictionary

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grammarnoun

uk   /ˈɡræm.ər/  us   //
A2 [U] (the ​study or use of) the ​rules about how words ​changetheirform and ​combine with other words to make ​sentences [C] mainly UK a ​book of grammar ​rules: a ​German grammar
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(Definition of grammar from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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