normal Adjective
( en adjective)
According to norms or rules.

Healthy; not sick or ill.

Pertaining to a school to teach teachers how to teach.

(chemistry) Of, relating to, or being a solution containing one equivalent weight of solute per litre of solution.
(organic chemistry) Describing a straight chain isomer of an aliphatic hydrocarbon, or an aliphatic compound in which a substituent is in the 1 position of such a hydrocarbon.
(physics) (Of a mode in an oscillating system ) In which all parts of an object vibrate at the same frequency; See .
(geometry) Perpendicular to a tangent line or derivative of a surface in Euclidean space.
* The interior normal vector of a ideal perfect sphere will always point toward the center, and the exterior normal vector directly away, and both will always be colinear with the ray whose' tip ends at the point of intersection, which is the intersection of all three sets of points.
(algebra) (Of a subgroup) whose cosets form a group.
(algebra) (Of a field extension of a field K) which is the splitting field of a family of polynomials in K.
(probability theory, statistics) (Of a distribution) which has a very specific bell curve shape.
(complex analysis) (Of a family of continuous functions) which is precompact.
(set theory) (Of a function from the ordinals to the ordinals) which is strictly monotonically increasing and continuous with respect to the order topology.
(linear algebra) (Of a matrix) which commutes with its conjugate transpose.
(functional analysis) (Of a Hilbert space operator) which commutes with its adjoint.
(category theory) (Of an epimorphism) which is the cokernel of some morphism.
(category theory) (Of a monomorphism) which is the kernel of some morphism.
(category theory) (Of a morphism) which is a normal epimorphism or a normal monomorphism.
(category theory) (Of a category) in which every monomorphism is normal.
(Of a real number) whose digits, in any base representation, enjoy a uniform distribution.
(topology) (Of a topology) in which disjoint closed sets can be separated by disjoint neighborhoods.
(rail transport, Of points) in the default position, set for the most frequently used route.
Synonyms
* (usual) conventional, ordinary, standard, usual, regular, average, expected, natural
* (healthy) hale, healthy, well
* (perpendicular) at right angles to, perpendicular, orthogonal
* (statistics) Gaussian
Antonyms
* (usual) unconventional, nonstandard, unusual
* (healthy) ill, poorly (British), sick, unwell
* (perpendicular) tangential
* (rail transport) reverse
Derived terms
* abnormal
* conormal
* normalcy
* normalise, normalize
* normality
* normally
* normal school
* normal vector
* orthonormal
* paranormal
* subnormal
* supernormal
* ultranormal
Related terms
* norm
Usage notes
* Warning: normal , when used to describe a majority group of people, can be considered offensive to those who don't consider membership of their own minority to be unusual. Care should be taken when juxtaposing normal, particularly with stereotypical labels, to avoid undue insult.
Noun
( en noun)
(geometry) A line or vector that is perpendicular to another line, surface, or plane.
(slang) A person who is normal, who fits into mainstream society, as opposed to those who live alternative lifestyles.
Synonyms
* (normal person) see

commonplace English
Adjective
( en adjective)
Ordinary; having no remarkable characteristics.
* 1824 , Sir (Walter Scott), , ch. 7:
 "This Mr. Tyrrel," she said, in a tone of authoritative decision, "seems after all a very ordinary sort of person, quite a commonplace man."
*
, title=( The Celebrity), chapter=1
, passage=In the old days, to my commonplace and unobserving mind, he gave no evidences of genius whatsoever. He never read me any of his manuscripts, […], and therefore my lack of detection of his promise may in some degree be pardoned.}}
* 1911 , (w), (Under Western Eyes) , ch. 1:
 I could get hold of nothing but of some commonplace phrases, those futile phrases that give the measure of our impotence before each other's trials.
Synonyms
* routine
* undistinguished
* unexceptional
* See also
Antonyms
* distinguished
* inimitable
* unique
Noun
( en noun)
A platitude or .
* 1899 , , Active Service , ch. 17:
 Finally he began to mutter some commonplaces which meant nothing particularly.
* 1910 , , His Hour , ch. 4:
 And something angered Tamara in the way the Prince assisted in all this, outcommonplacing her friend in commonplaces with the suavest politeness.
Something that is ordinary.
* 1891 , , "A Case of Identity" in The Adventures of Sherlock Holmes :
 "My dear fellow," said Sherlock Holmes as we sat on either side of the fire in his lodgings at Baker Street, "life is infinitely stranger than anything which the mind of man could invent. We would not dare to conceive the things which are really mere commonplaces of existence."
A memorandum; something to be frequently consulted or referred to.
* Jonathan Swift
 Whatever, in my reading, occurs concerning this our fellow creature, I do never fail to set it down by way of commonplace .
A commonplace book.
Verb
( commonplac)
To make a commonplace book.
To enter in a commonplace book, or to reduce to general heads.
* Felton
 I do not apprehend any difficulty in collecting and commonplacing an universal history from the historians.
(obsolete) To utter commonplaces; to indulge in platitudes.
* 1910 , , His Hour , ch. 4:
 And something angered Tamara in the way the Prince assisted in all this, outcommonplacing her friend in commonplaces with the suavest politeness.
 (Francis Bacon)
