His grammar was poor.
An example of grammar is how commas and semicolons are supposed to be used.
The grammar of music.
A grammar of geography.
Other Word Forms
Origin of grammar
- Middle English gramere from Old French gramaire alteration of Latin grammatica from Greek grammatikē from feminine of grammatikos of letters from gramma grammat- letter gerbh- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition