Definitions from Wiktionary ( )

▸ noun:  (chiefly Canada, US) An enemy, especially an archenemy.
▸ noun:  (chiefly outside the US and Canada) A person or character who specifically brings about the downfall of another person or character, as an agent of that character's fate or destiny, especially within a narrative.
▸ noun:  The personification of the "fatal flaw" of a dramatic hero in the style of Greek tragedy.
▸ noun:  Polar opposite, especially of a literary character.
▸ noun:  The principle of retributive justice.
▸ noun:  (usually in the singular, formal) A punishment or defeat that is deserved and cannot be avoided; (an instance of) retribution.
▸ noun:  (Greek mythology) The goddess of divine retribution.
▸ noun:  (astronomy) 128 Nemesis, a main belt asteroid.
▸ noun:  (astronomy) A hypothetical star postulated to be orbiting the Sun to explain a perceived cycle of mass extinctions in the geological record.

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