Definition of non sequitur
1
: an inference (see inference 2) that does not follow from the premises (see 1premise 1);
specifically
: a fallacy resulting from a simple conversion of a universal affirmative (see 1affirmative 3) proposition or from the transposition of a condition and its consequent (see 1consequent 1)
2
: a statement (such as a response) that does not follow logically from or is not clearly related to anything previously said
- We were talking about the new restaurant when she threw in some non sequitur about her dog.
