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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