inter- /ɪntə $ -tər/ BrE AmE prefix
[ Language: Old French ; Origin: inter- , entre- , from Latin inter- , from inter 'among' ]
between or involving two or more different things, places, or people ⇨ intra- , intro- :
interdepartmental (=between or involving different departments in a company, government etc)
an interstate (=a road that goes between states)