derivation has 5 distinct synonyms spread across 2 of its 8 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the source or origin from which something derives (i.e. comes or issues)
“he prefers shoes of Italian derivation”
(historical linguistics) an explanation of the historical origins of a word or phrase
Synonyms, antonyms and the broader and narrower relations for derivation come from Princeton University’s WordNet. Full sources and licences.
a line of reasoning that shows how a conclusion follows logically from accepted propositions
(descriptive linguistics) the process whereby new words are formed from existing words or bases by affixation
“`singer' from `sing' or `undo' from `do' are examples of derivations”
drawing of fluid or inflammation away from a diseased part of the body
drawing off water from its main channel as for irrigation
the act of deriving something or obtaining something from a source or origin