13 letters · 17 points in Scrabble
noun act of working jointly
noun act of cooperating traitorously with an enemy that is occupying your country
originOriginated 1855–60 from French collaboration, from Late Latin collaboratus + -ion, from Latin con- (“with”) + labōrō (“work”). Morphologically collaborate + -ion.
Etymology from Wiktionary, CC BY-SA 3.0