Wiktionary
inter nos
adv. Between ourselves.
Wikipedia
Inter Nos
Inter Nos is a 1982 Icelandic drama film directed by Hrafn Gunnlaugsson. It was selected as the Icelandic entry for the Best Foreign Language Film at the 55th Academy Awards, but was not accepted as a nominee.
Usage examples of "inter nos".
Dum licet inter nos igitur laetemur amantes, he said, handing me a cup.