noun

1. one tenth of the annual produce of one's land or of one's annual income, paid as a tax or contribution to support a church or its clergy
2. 1. a tenth part
   2. any small part
3. any tax or levy

Etymology: ME < OE teothe, contr. < teogotha, a tenth

transitive verb tithed, tithing tith′·ing

1. to pay a tithe of (one's produce, income, etc.)
2. to levy a tithe on or collect a tithe from

Etymology: ME tithen < OE teothian < the n.

intransitive verb