Normal  —adj. 1 conforming to a standard; regular, usual, typical. 2 free from mental or emotional disorder. 3 geom. (of a line) at right angles, perpendicular. —n. 1 a normal value of a temperature etc. B usual state, level, etc. 2  line at right angles.  normalcy n. Esp. Us. Normality n. [latin normalis: related to *norm]