1. a suit of loose pants and jacket or shirt for sleeping in: "a pair of pajamas"
▪ any clothing suitable for wearing in bed; nightclothes: "a picture of a baby in one-piece pajamas"
▪ a pair of loose pants tied by a drawstring around the waist, worn by both sexes in some Asian countries:"he was attired in an off-white kurta, white pajama, and red waistcoat"
Word Originearly 19th century: from Urdu and Persian, from pāy ‘leg’ + jāma ‘clothing’.