## Definition of normal

**:**perpendicular; especially

**:**perpendicular to a tangent (see

^{1}tangent 3) at a point of tangency

**:**according with, constituting, or not deviating from a norm, rule, or principle

- The normal way to pluralize a noun is by adding
*-s*.

**:**conforming to a type, standard, or regular pattern

- normal working hours

- He had a normal childhood.

- the effect of normal aging

**:**occurring naturally

- normal immunity

**:**of, relating to, or characterized by average intelligence or development

- IQs within the normal range

**:**free from mental illness

**:**mentally sound

- symptoms of paranoia in otherwise normal persons

**:**not associated

- normal molecules

**:**having a straight-chain structure

- normal butyl alcohol

**:**having the property that every coset produced by operating on the left by a given element is equal to the coset produced by operating on the right by the same element

**:**relating to, involving, or being a normal curve or normal distribution

- normal approximation to the binomial distribution

**:**having the property of commutativity under multiplication by the transpose of the matrix (see matrix 5a) each of whose elements is a conjugate (see

^{1}conjugate 2b) complex number with respect to the corresponding element of the given matrix