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or centr- or centri-
Center: centroid.

[From Latin centrum and Greek kentron; see center.]




or before a vowel


combining form
denoting a centre: centroclinal; centromere; centrosome; centrosphere; centrist.
[from Greek kentron centre]


(ˈsɛn tər)

1. the point within a circle or sphere equally distant from all points of the circumference or surface, or the point within a regular polygon equally distant from the vertices.
2. a point, pivot, or axis around which something rotates or revolves.
3. the core or middle of something.
4. the source of an influence, action, or force: the center of a problem.
5. a focus of interest or concern.
6. a principal point, place, or object: a shipping center.
7. a building or part of a building used as a meeting place or having facilities for activities.
8. an office or other facility providing a service or dealing with a particular emergency.
9. a person, thing, or group occupying the middle position, esp. a body of troops.
10. a store or establishment devoted to a particular subject or hobby: a garden center.
12. (usu. cap.)
a. (esp. in continental Europe) the members of a legislative assembly who hold views intermediate between those of the Right and Left, customarily seated in the center of the chamber.
b. individuals or groups holding moderate views, esp. in politics.
c. the moderate position held by these people.
a. a football lineman in the middle of the line who puts the ball into play by tossing it between his legs to a back.
b. the position played by this lineman.
a. a basketball player, usu. the team's tallest, who plays close to and in front of the basket.
b. this position or role.
15. an ice hockey player who participates in a face-off at the beginning of play.
16. Math.
a. the mean position of a figure or system.
b. the set of elements of a group that commute with every element of the group.
17. a tapered rod, mounted in the headstock spindle or the tailstock spindle of a lathe, upon which the work to be turned is placed.
18. to place in or on a center.
19. to collect to or around a center; focus: He centered his novel on the Civil War.
20. to determine or mark the center of.
21. to adjust, shape, or modify (an object, part, etc.) so that its axis or the like is in a central or normal position.
22. Football. snap (def. 19).
23. to be at or come to a center.
24. to come to a focus; converge; concentrate (fol. by at, about, around, in, or on).
25. to gather or accumulate in a cluster; collect (fol. by at, about, around, in, or on).
Also, esp. Brit.,centre.
[1325–75; < Latin centrum < Greek kéntron needle, pivoting point in drawing a circle, derivative of kenteîn to sting]
cen′ter•a•ble, adj.
cen′ter•less, adj.
usage: Although frequently condemned as illogical, the phrases center about and center around have appeared in edited writing for more than a century to express the sense of collecting or gathering as if around a center. The phrase revolve around is often suggested as a substitute; the prepositions at, in, and on are regarded as acceptable with center in this sense: Their objections centered on his lack of experience.
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