the study of the way the sentences of a language are constructed; morphology and syntax.

these features or constructions themselves

English grammar.

an account of these features; a set of rules accounting for these constructions

a grammar of English.

Generative Grammar . a device, as a body of rules, whose output is all of the sentences that are permissible in a given language, while excluding all those that are not permissible.

prescriptive grammar.

knowledge or usage of the preferred or prescribed forms in speaking or writing

She said his grammar was terrible.

the elements of any science, art, or subject.

a book treating such elements.

noun

abcs , accidence , alphabet , elements , fundaments , linguistics , morphology , principles , rudiments , sentence structure , stratification , structure , syntax , tagmemicsnotes:grammar consists of a description of all the elements in a language; syntax focuses on the relationships between words that determine their order in sentences - grammar is the entire study and syntax is one part only , conjugation , purism