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.
      [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

TITHING, Eng. law. Formerly a district containing ten men with their
families. In each tithing there was a tithing man whose duty it was to keep
the peace, as a constable now is bound to do. St. Armand, in his Historical
Essay on the Legislative Power of England, p. 70, expresses, an opinion that
the tithing was composed not of ten common families, but of ten families of
lords of a manor.