Similar to quadra
- quadraginta – forty
- quadratus – a square, square
- quadrum – a square
- quadruplator – an exaggerator, informer
- quasi – a sort of, as if, as it were, just as, just as if
- quadrivium – crossroads, place where four roads meet, second stage of the medieval curriculum
- quamobrem – for which reason, on which account, why