'sequitur' originates from Latin, specifically the verb form 'sequitur' (from the root 'sequi'), where 'sequi' meant 'to follow'.

'sequitur' was used in Classical and Medieval Latin as the 3rd person singular present form of 'sequi' and entered English primarily through the Latin phrase 'non sequitur'; over time it was also taken as a standalone noun meaning a conclusion or something that follows.

Initially in Latin it meant 'he/she/it follows' (a present-tense verb form), but in English it evolved to mean 'a logical consequence' or, in the phrase 'non sequitur', 'a remark that does not follow'.