(noun.) the act of deriving something or obtaining something from a source or origin.
(noun.) drawing off water from its main channel as for irrigation.
(noun.) drawing of fluid or inflammation away from a diseased part of the body.
(noun.) a line of reasoning that shows how a conclusion follows logically from accepted propositions.
(noun.) the source or origin from which something derives (i.e. comes or issues); 'he prefers shoes of Italian derivation'; 'music of Turkish derivation'.
(noun.) (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'.
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