The Collaborative International Dictionary of English v.0.48:

Tithe \Tithe\, v. t. [imp. & p. p. Tithed; p. pr. & vb. n.
   Tithing.] [As. te['o]?ian.]
   To levy a tenth part on; to tax to the amount of a tenth; to
   pay tithes on.
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         Ye tithe mint and rue.                   --Luke xi. 42.
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The Collaborative International Dictionary of English v.0.48:

Tithing \Tith"ing\, n. [AS. te['o]?ung.]
   1. The act of levying or taking tithes; that which is taken
      as tithe; a tithe.
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            To take tithing of their blood and sweat. --Motley.
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   2. (O. Eng. Law) A number or company of ten householders who,
      dwelling near each other, were sureties or frankpledges to
      the king for the good behavior of each other; a decennary.
      --Blackstone.
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