English▸ plural noun a suit of loose pants and jacket or shirt for sleeping in:
a pair of pajamas
(as modifier pajama) pajama bottoms.
▪ any clothing suitable for wearing in bed; nightclothes:
a picture of a baby in one-piece pajamas
wearing a T-shirt as pajamas, I climbed into bed.
▪ [in singular] (pajama) 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.
– ORIGIN early 19th century : from Urdu and Persian, from pāy ‘leg’ + jāma ‘clothing’.