tithe
noun
[ tʌɪð ]
• one tenth of annual produce or earnings, formerly taken as a tax for the support of the Church and clergy.
tithe
verb
• pay or give as a tithe.
• "he tithes 10 per cent of his income to the Church"
Origin:
Old English tēotha (adjective in the ordinal sense ‘tenth’, used in a specialized sense as a noun), tēothian (verb).