non sequitur

1. 1.

   a reply that has no relevance to what preceded it

   Broaderreply
2. 2.

   (logic) a conclusion that does not follow from the premises

   Broaderconclusion

   logic

Questions about non sequitur

What does non sequitur mean?

non sequitur means "a reply that has no relevance to what preceded it". That is the primary sense; the word has 2 in total, listed in full on this page.

Is non sequitur a common word?

non sequitur is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.