Any force acting normal, to a surface, or perpendicular to the tangent plane.

(sports) The standard period of play, contrasted with any additional periods such as injury time, extra time or penalty shootout.

(differential geometry) A unit vector at any given point P of a surface M which is perpendicular to the tangent plane T_P(M) of M at P. For a surface with parametrization ⃑x(u,v), it is given by

(animation) The four frames of silence between each line of dialog. The name refers to what would be normal pausing between words in the cadence of someone's typical speech pattern.

(geology) A type of fault in which the footwall moves up relative to the hanging wall.

plural of normal fault

plural of normal distribution

The final depth of water in an open channel that is subject to continuous uniform flow

(physics, chemistry) The electrode potential with reference to that of a normal hydrogen electrode

(obsolete) A school for training teachers, especially in mainland Europe and North America.