10 letters · 14 points in Scrabble
noun the source or origin from which something derives (i.e. comes or issues)
noun (historical linguistics) an explanation of the historical origins of a word or phrase
noun a line of reasoning that shows how a conclusion follows logically from accepted propositions
originFrom Middle English derivacioun, borrowed from Middle French dérivation, from Latin dērīvātiō, dērīvātiōnem. Morphologically derive + -ation.
Etymology from Wiktionary, CC BY-SA 3.0