center

If a point be taken within a circle, and more than two equal straight lines fall from the point on the circle, the point taken is the centre of the circle.

1908, Euclid, translated by Thomas L. Heath, Elements, III.9:

The point in the interior of a circle that is equidistant from all points on the circumference.

Japanese scientists are to explore the centre of the Earth. Using a giant drill ship launched next month, the researchers aim to be the first to punch a hole through the rocky crust that covers our planet and to reach the mantle below.

The point in the interior of a sphere that is equidistant from all points on the circumference.

The middle portion of something; the part well away from the edges.

[...] their portion set
As far remov'd from God and light of Heav'n
As from the Center thrice to th'utmost Pole.

1667, John Milton, “Book I”, in Paradise Lost. […], London: […] [Samuel Simmons], and are to be sold by Peter Parker […]; [a]nd by Robert Boulter […]; [a]nd Matthias Walker, […], →OCLC; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873, →OCLC, lines 73-75:

Leo. No: if I mistake
In those Foundations which I build upon,
The Centre is not bigge enough to beare
A Schoole-Boyes Top.

c. 1610–1611 (date written), William Shakespeare, “The Winters Tale”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act II, scene i], page 282, column 2:

(obsolete) The innermost point of the Earth, or the Earth itself, as the center or foundation of the Universe; the center or foundation of the Universe abstractly.

(geometry) The point on a line that is midway between the ends.

(geometry) The point in the interior of any figure of any number of dimensions that has as its coordinates the arithmetic mean of the coordinates of all points on the perimeter of the figure (or of all points in the interior for a center of volume).

shopping center, convention center, civic center, garment center, Lincoln Center for the Performing Arts, Rockefeller Center

A place, especially a building or complex, set aside for some specified function or activity.

(politics) The ensemble of moderate or centrist political parties.

In Anatolia tensions between state officials (ehl-i örf) and the peasants were strained to breaking point.
At several places—particularly in the frontier provinces—there were fierce clashes between the janissaries stationed there and the governors. In Aleppo and Damascus incidents were common after 1589: the kuls threw rocks at the beylerbeyi’s house, killed people, broke into the divan several times and took the money prepared by the council for remittance to the centre.

2018, Pál Fodor, The Business of State. Ottoman Finance Administration and Ruling Elites in Transition (1580s–1615) (Studien zur Sprache, Geschichte und Kultur der Turkvölker; 28), Berlin: Klaus Schwarz Verlag × De Gruyter, published 2020, →DOI, →ISBN, page 50:

The venue in which the head of government in a centralized state is situated.

the center of the controversy

the center of attention

A topic that is particularly important in a given context, the element in a subject of cognition, volition or discussion that is perceived as decisive.

(sports) A player in the middle of a playing area.

(basketball) The player, generally the tallest, who plays closest to the basket.

(ice hockey) The forward that generally plays between the left wing and right wing and usually takes the faceoffs.

(American football, Canadian football) The person who holds the ball at the beginning of each play.

(netball) A player who can go all over the court, except the shooting circles.

Bent twice sent efforts wide of the far post after cutting in from the left, Wellbeck missed his kick from an inviting centre and failed to get on the end of a looping pass when six yards out.

2010 December 28, Owen Phillips, “Sunderland 0 - 2 Blackpool”, in BBC:

(soccer) A pass played into the centre of the pitch.

Gatland's side got back to within striking distance when fly-half Jones's clever pass sent centre Jonathan Davies arcing round Shontayne Hape.

2011 February 4, Gareth Roberts, “Wales 19-26 England”, in BBC:

(rugby) One of the backs operating in a central area of the pitch, either the inside centre or outside centre.

A certain mechanical implement functioning in the middle of a whole apparatus

(architecture) A temporary structure upon which the materials of a vault or arch are supported in position until the work becomes self-supporting.

(engineering) One of the two conical steel pins in a lathe, etc., upon which the work is held, and about which it revolves.

(engineering) A conical recess or indentation in the end of a shaft or other work, to receive the point of a center, on which the work can turn, as in a lathe.

(Australia, New Zealand) The ring in the gambling game two-up in which the spinner operates.

(algebra, group theory, ring theory) The set of those elements (of a given algebraic structure) that commute with every other element, usually denoted Z(G). In the case of (semi-)groups, it is required that they commute under the (semi-)group operation; in the case of rings and (Lie) algebras, under mulitplication (i.e. the bracket for Lie algebras)

centroid

point in the interior of figure with mean coordinates

sentrum

point equidistant from all points on the perimeter of a circle

sentrum

point equidistant from all points on the surface of a sphere

centro

set of elements of a group that commute with all elements

مَرْكَز

place where a function or activity occurs

centr

soccer: pass into the center of the pitch

kärki

engineering: one of the two conical steel pins in a lathe

From Middle English center, centre, from Middle French centre, from Latin centrum, from Ancient Greek κέντρον (kéntron), from κεντεῖν (kenteîn, “to prick, goad”). Doublet of centrum.
* (group theory): In the notation Z(G), the letter Z derives from the German Zentrum (“center”).


center

????, Matthew Prior, Celia to Damon
Thy joys are centred all in me alone.

He centered the heading of the document.

(transitive) To cause (an object) to occupy the center of an area.

(transitive) To cause (some attribute, such as a mood or voltage) to be adjusted to a value which is midway between the extremes.

However, Lucas also centered the plot around the protection of the secret Death Star plans, which now filled the role of the clan treasure the enemy is seeking in Hidden Fortress; […]

2012, Michael Kaminski et al., chapter 7, in Myth, Media, and Culture in Star Wars: An Anthology, page 87:

(transitive) To give (something) a central basis.

The plot centers on the life of a working-class family.

The discussion centered around the recent issues.

(intransitive) To concentrate on (something), to pay close attention to (something).

(engineering) To form a recess or indentation for the reception of a center.

en-verb

center (third-person singular simple present centers, present participle centering, simple past and past participle centered)

centers (present singular third-person)
centering (participle present)
centered (participle past)
centered (past)

центрирам

cause something to have a value midway between extremes