(photography) A lens which produces an image similar in detail and angular perspective to the view produced by the human eye, as distinct from a wide-angle lens or a telephoto lens.

(economics) a good for which demand increases when income increases and falls when income decreases but price remains constant, i.e. with a positive income elasticity of demand.

(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

plural of normal school

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

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

plural of normal form