The difference between Decim and Tithe

Decim as a noun (obsolete):

A tenth, a tithe or tax of one-tenth.

Decim as a noun (uncommon):

A decimeter.

Tithe as a noun (archaic):

A tenth.

Tithe as a noun (historical):

The tenth part of the increase arising from the profits of land and stock, allotted to the clergy for their support, as in England, or devoted to religious or charitable uses. Almost all the tithes of England and Wales are commuted by law into rent charges. The concept originates in the Hebrew Scriptures (Old Testament).

Tithe as a noun:

A contribution to one's religious community or congregation of worship (notably to the LDS church)

Tithe as a noun:

A small part or proportion.

Tithe as an adjective (archaic):

Tenth.

Tithe as a verb (transitive):

To give one-tenth or a tithe of something, particularly: To pay something as a tithe. To pay a tithe upon something. To pay a tithe; to pay a 10% tax To pay or offer as a levy in the manner of a tithe or religious tax.

Tithe as a verb (transitive):

To take one-tenth or a tithe of something, particularly: To impose a tithe upon someone or something. To spare only every tenth person, killing the rest . To enforce or collect a tithe upon someone or something. To decimate: to kill every tenth person, usually as a military punishment. To enforce or collect a tithe.

Tithe as a verb (transitive, obsolete):

To compose the tenth part of something.

Tithe as a noun (obsolete):

A boon .

Tithe as an adjective (obsolete):

Receiving a concession or grant; successful in prayer or request.

Tithe as a verb (transitive, obsolete):

To grant, concede.