From gnu Comprehensive Interactive Dictionary of English:
International \In`ter*na"tion*al\, a. [Pref. inter- + national: cf. F. international.] [1913 Webster] 1. Between or among nations; pertaining to the intercourse of nations; participated in by two or more nations; common to, or affecting, two or more nations. [1913 Webster] 2. Of or concerning the association called the International. [1913 Webster] 3. Independent of national boundaries; common to all people; as, the atmosphere is an international resource; the international community of scholars. [PJC]
'pertaining to the intercourse of nations'
I assume this is from Websters 1913 if not older. It's very dated as is likely to confuse readers (it confused me) as intercourse means sex and nowadays it's not used with any other meaning. Renard Migrant (talk) 17:16, 7 October 2016 (UTC)