1. pyjama(n = noun.artifact) pajama - a pair of loose trousers tied by a drawstring around the waist; worn by men and women in some Asian countries;
is a kind of pant, trouser
2. pyjama(n = noun.artifact) jammies, pajama, pj's - (usually plural) loose-fitting nightclothes worn for sleeping or lounging; have a jacket top and trousers;
is a kind of nightclothes, nightwear, sleepwear
has particulars: sleeper
In India and Persia, thin loose trowsers or drawers; in Europe and America, drawers worn at night, or a kind of nightdress with legs. Usually used in the plural. See pajamas. [1913 Webster]