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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   tithe
       n 1: a levy of one tenth of something
       2: an offering of a tenth part of some personal income
       v 1: exact a tithe from; "The church was tithed"
       2: levy a tithe on (produce or a crop); "The wool was tithed"
       3: pay one tenth of; pay tithes on, especially to the church;
          "He tithed his income to the Church"
       4: pay a tenth of one's income, especially to the church;
          "Although she left the church officially, she still tithes"