A result of a test that shows as present something that is absent. / (statistics) type I error

(biology) referring to an RNA strand that can serve directly as messenger RNA and be transcribed into DNA.

A position for sexual intercourse in which the man and woman face each other, with the man on top.

(advertising) One of four archetypal dramatic structures of commercials, characterized by an emotionally neutral beginning with an enormous leap in positive emotions generated by seeing the branded product in use.

(medicine, bacteriology, of a bacterium) That is stained violet by Gram's method

A cross-legged sitting position in which the feet are resting on the thigh of the opposite leg; a meditative position in Hinduism and Buddhism, also used in yoga and sexual intercourse.

Infected by HIV.

(law) Law explicitly made, as compared to natural law, prescribed by express enactment or institution.

plural of positive law

Often used other than figuratively or idiomatically: to assume a given position.