the branch of linguistics that deals with syntax and morphology (and sometimes also deals with semantics)
"After years of studying grammar, she became an expert in how words are structured within sentences."
A system of rules and principles for speaking and writing a language.
"He spent hours studying grammar to understand the system of rules that governs how sentences are formed in English."
In plain English: Grammar is the set of rules that tells you how to put words together correctly so people can easily understand what you are saying or writing.
"She had to study grammar before she could take her English exam."
Usage: Use this noun to refer specifically to the set of structural rules governing how words combine in speech or writing, rather than general correctness. Avoid confusing it with "syntax," which describes only word order and sentence structure within that broader system.
To discourse according to the rules of grammar; to use grammar.
"The teacher praised the student for their ability to speak without breaking any grammatical rules."
In plain English: To grammar something means to organize its parts correctly according to standard rules of language structure.
"The teacher told him to grammar his sentences before submitting them for review."
The word "grammar" comes from the Ancient Greek grammatikḗ, which originally meant "skilled in writing." It entered English via Old French and Middle English, replacing an earlier native term related to staff work.