Q

quadrate v. To divide into quarters.
qualm n. A fit of nausea.
quandary n. A puzzling predicament.
quantity n. Magnitude.
quartet n. A composition for four voices or four instruments.
quarto n. An eight-page newspaper of any size.
quay n. A wharf or artificial landing-place on the shore of a harbor or projecting into it.
queue n. A file of persons waiting in order of their arrival, as for admittance.
quiescence n. Quiet.
quiescent adj. Being in a state of repose or inaction.
quietus n. A silencing, suppressing, or ending.
quintessence n. The most essential part of anything.
quintet n. Musical composition arranged for five voices or instruments.
Quixotic adj. Chivalrous or romantic to a ridiculous or extravagant degree.