Meaning of NORMAL in English


I. ˈnȯrməl, ˈnȯ(ə)m- adjective

Etymology: in sense 1, from Latin normalis according to a square, forming a right angle, from norma carpenter's square, pattern, rule (probably from Greek gnōmona, accusative of gnōmōn interpreter, discerner, pointer on a sundial, carpenter's square) + -alis -al; in senses 2-7 and 9-10, from Late Latin normalis according to rule, from Latin, according to a square; in sense 8, translation of French normale (in école normale normal school) — more at gnomon

1. : forming a right angle : perpendicular

2. : according to, constituting, or not deviating from an established norm, rule, or principle : conformed to a type, standard, or regular pattern : not abnormal : regular

normal word order of subject and verb

normal working hours

normal pronunciation


a. : unaffected by or not exposed to any particular infection or experimental treatment

a normal control animal

b. : occurring naturally and not because of disease, inoculation, or any experimental treatment

normal immunity


a. : of, relating to, or characterized by average intelligence or development : free from intellectual defect

b. : free from mental disorder : having neither neurosis, personality disorder, nor psychosis : sane

c. : characterized by balanced, well-integrated functioning of the organism as a whole within the limits imposed by the environment and in accord with the pattern of one's biological endowment

5. : relating to or conforming with long-run expectations or to a permanent standard deviations from which on the part of individual economic phenomena are to be regarded as self-corrective

a normal price corresponds to long-run costs of production


a. : approximating the statistical norm or average

a normal infant mortality rate

normal rainfall of the region

b. : consistent with the social norm

normal married life

7. : average over many years at a particular place and for a definite time, a certain day, or some other specified period — used of a meteorological element

8. : of or relating to the training of teachers

normal college

normal department

9. : of, relating to, or characterized by full ablaut grade


a. of a solution : having a concentration of one gram equivalent of solute per liter

normal hydrochloric acid

— abbr. N

b. : being an assumed fundamental compound (as an acid from which the known acids are obtained by dehydration)

normal sulfuric acid S(OH) 6

— compare orth- 3a

c. : containing neither basic hydroxyl nor acid hydrogen

normal silver phosphate Ag 3 PO 4

— used of a compound (as a salt, ester, or amide)

d. : not associated

normal liquids

normal molecules

e. : having a straight-chain structure

normal pentane

normal butyl alcohol

— abbr. n ; used of an aliphatic hydrocarbon, one of its derivatives, or an alkyl radical; compare is- 2b

f. : cis — used especially of stereoisomeric compounds containing two fused saturated rings; contrasted with allo

the allo and normal forms of steroids

Synonyms: see regular

II. noun

( -s )

1. mathematics

a. : perpendicular:

(1) : a line perpendicular to the tangent line to a curve at a point of the curve

(2) : a plane perpendicular to the tangent plane to a surface at a point on the surface

b. : the intercept on the normal line between a curve and the x-axis

2. : one that is normal: as

a. : a normal person or organism

b. : a normal level (as of temperature, pressure, rainfall, price) : mean , average

c. : normal school

3. : a form or state regarded as the norm : standard

III. adjective

1. of a subgroup : having the property that every coset produced by operating on the left with a given element is equal to the coset produced by operating on the right with the same element

2. : relating to, involving, or being a normal curve or normal distribution

normal approximation to the binomial distribution

3. of a matrix : having the property of commutativity under multiplication by the transpose of a matrix each of whose elements is a conjugate complex number with respect to the corresponding element of the given matrix

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.