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 co-linear 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 pre-compact.

(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.

Adjective

(en adjective)

Of or relating to the first class or rank, especially in literature or art.

* 1661 , , The Life of the most learned, reverend and pious Dr. H. Hammond

During the whole time of his abode in the university he generally spent thirteen hours of the day in study; by which assiduity besides an exact dispatch of the whole course of philosophy, he read over in a manner all classic authors that are extant

* (Lord Byron) (1788-1824)

Give, as thy last memorial to the age, / One classic drama, and reform the stage.

Exemplary of a particular style.

Exhibiting timeless quality.

* {{quote-book, year=1963, author=(Margery Allingham), title=(The China Governess)

, chapter=20 citation , passage=The story struck the depressingly familiar note with which true stories ring in the tried ears of experienced policemen. No one queried it. It was in the classic pattern of human weakness, mean and embarrassing and sad.}}

* {{quote-magazine, date=2013-01-01, author=Paul Bartel, Ashli Moore

, volume=101, issue=1, page=47–48, magazine=(American Scientist) , title= Avian Migration: The Ultimate Red-Eye Flight , passage=Many of these classic methods are still used, with some modern improvements. For example, with the aid of special microphones and automated sound detection software, ornithologists recently reported […] that pine siskins (Spinus pinus ) undergo an irregular, nomadic type of nocturnal migration.}}

Of or pertaining to the ancient Greeks and Romans, especially to Greek or Roman authors of the highest rank, or of the period when their best literature was produced; of or pertaining to places inhabited by the ancient Greeks and Romans, or rendered famous by their deeds.

* (Felicia Hemans) (1804-1864)

Though throned midst Latium's classic plains.

(euphemistic) Traditional; original.