internation I. in·tern·ation\ˌinˌtərˈnāshən\noun (-s) Etymology: French, from interner to intern + -ation — more at intern : the act of interning or the state of being interned : internment II. in·ter·nation\|intə(r)+\noun Etymology:inter- + nation : a population composed of or representing several nationalities III. internationadjective Etymology:inter- + nation : existing or occurring between nations < internation rivalry >