The Collaborative International Dictionary of English v.0.48:

Share \Share\, n. [OE. share, AS. scearu, scaru, fr. sceran to
   shear, cut. See Shear, v.]
   1. A certain quantity; a portion; a part; a division; as, a
      small share of prudence.
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   2. Especially, the part allotted or belonging to one, of any
      property or interest owned by a number; a portion among
      others; an apportioned lot; an allotment; a dividend. "My
      share of fame." --Dryden.
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   3. Hence, one of a certain number of equal portions into
      which any property or invested capital is divided; as, a
      ship owned in ten shares.
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   4. The pubes; the sharebone. [Obs.] --Holland.
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   To go shares, to partake; to be equally concerned.

   Share and share alike, in equal shares.
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The Collaborative International Dictionary of English v.0.48:

Share \Share\, n. [OE. schar, AS. scear; akin to OHG. scaro, G.
   schar, pflugshar, and E. shear, v. See Shear.]
   1. The part (usually an iron or steel plate) of a plow which
      cuts the ground at the bottom of a furrow; a plowshare.
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   2. The part which opens the ground for the reception of the
      seed, in a machine for sowing seed. --Knight.
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The Collaborative International Dictionary of English v.0.48:

Share \Share\, v. t. [imp. & p. p. Shared; p. pr. & vb. n.
   Sharing.]
   1. To part among two or more; to distribute in portions; to
      divide.
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            Suppose I share my fortune equally between my
            children and a stranger.              --Swift.
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   2. To partake of, use, or experience, with others; to have a
      portion of; to take and possess in common; as, to share a
      shelter with another.
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            While avarice and rapine share the land. --Milton.
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   3. To cut; to shear; to cleave; to divide. [Obs.]
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            The shared visage hangs on equal sides. --Dryden.
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The Collaborative International Dictionary of English v.0.48:

Share \Share\, v. i.
   To have part; to receive a portion; to partake, enjoy, or
   suffer with others.
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         A right of inheritance gave every one a title to share
         in the goods of his father.              --Locke.
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WordNet (r) 3.0 (2006):

share
    n 1: assets belonging to or due to or contributed by an
         individual person or group; "he wanted his share in cash"
         [syn: share, portion, part, percentage]
    2: any of the equal portions into which the capital stock of a
       corporation is divided and ownership of which is evidenced by
       a stock certificate; "he bought 100 shares of IBM at the
       market price"
    3: the allotment of some amount by dividing something; "death
       gets more than its share of attention from theologians" [syn:
       parcel, portion, share]
    4: the part played by a person in bringing about a result; "I am
       proud of my contribution in advancing the project"; "they all
       did their share of the work" [syn: contribution, part,
       share]
    5: a sharp steel wedge that cuts loose the top layer of soil
       [syn: plowshare, ploughshare, share]
    v 1: have in common; "Our children share a love of music"; "The
         two countries share a long border"
    2: use jointly or in common
    3: have, give, or receive a share of; "We shared the cake" [syn:
       partake, share, partake in]
    4: give out as one's portion or share [syn: share, divvy up,
       portion out, apportion, deal]
    5: communicate; "I'd like to share this idea with you"