pajamas /pəˈd͡ʒæ.məz/noun 3phrases 1 noun[plural only]3 •Clothes for wearing to bed and sleeping in, usually consisting of a loose-fitting shirt and pants/trousers.She put on a coat over her new pair of pajamas. •Loose-fitting trousers worn by both sexes in various southern Asian countries including India. •(slang) The coloured uniform worn by players in professional limited overs matches. Phrases with pajamas the cat's pajamasA highly sought-after and fancy example of something, usually referring to inanimate objects.