资料来源 : Webster's Revised Unabridged Dictionary (1913)

Center \Cen"ter\, Centre \Cen"tre\ v. i. [imp. & p. p.
   {Centered} or {Centred}; p. pr. & vb. n. {Centering} or
   {Centring}.]
   1. To be placed in a center; to be central.

   2. To be collected to a point; to be concentrated; to rest
      on, or gather about, as a center.

            Where there is no visible truth wherein to center,
            error is as wide as men's fancies.    --Dr. H. More.

            Our hopes must center in ourselves alone. --Dryden.

Centering \Cen"ter*ing\, n. (Arch.)
   Same as {Center}, n., 6. [Written also {centring}.]

资料来源 : WordNet®

centering
     n 1: the concentration of attention or energy on something; "the
          focus of activity shifted to molecular biology"; "he had
          no direction in his life" [syn: {focus}, {focusing}, {focussing},
           {direction}]
     2: (American football) putting the ball in play by passing it
        (between the legs) to a back; "the quarterback fumbled the
        snap" [syn: {snap}]