Definitions from Wiktionary (decimate)

▸ verb:  (archaic) To kill one-tenth of (a group), (historical, specifically) as a military punishment in the Roman army selected by lot, usually carried out by the surviving soldiers.
▸ verb:  To destroy or remove one-tenth of (something).
▸ verb:  (loosely) To devastate: to reduce or destroy significantly but not completely.
▸ verb:  (obsolete) To exact a tithe or other 10% tax.
▸ verb:  (obsolete, rare) To tithe: to pay a 10% tax.
▸ verb:  (obsolete) To divide into tenths; to decimalize.
▸ verb:  (proscribed) To reduce to one-tenth: to destroy or remove nine-tenths of (something).
▸ verb:  (computer graphics) To replace (a high-resolution model) with another of lower but acceptable quality. (Usually algorithmically)
▸ noun:  (obsolete) A tithe or other 10% tax or payment.
▸ noun:  (obsolete) A tenth of something.
▸ noun:  (obsolete) A set of ten items.
▸ Also see decimate

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