- (linguistics) In violation of one or more of the rules and conventions of a language as defined by the grammar, resulting in unacceptable, or incorrect, usage.
In formal linguistics, ungrammatical sentences are labelled using an asterisk (*):
- *The subject of this sentence is.
This convention goes back at least as far as Leonard Bloomfield's Language (1933).
in violation of one or more of the rules and conventions of a language