1. a feeling of sickness with an inclination to vomit: "a wave of nausea engulfed him"Similarsicknessbiliousnessqueasinessvomitingretchinggaggingtravel-sicknessseasicknesscarsicknessairsicknessmotion sicknessmorning sicknessaltitude sicknessinformal:throwing uppukingrare:qualms