| Term | Definition |
| inter | between, among, amid |
| international | between or among nations |
| interject | to throw between |
| interaction | discussion or action between or among people |
| intervene | to come between |
| intergalactic | between or among the stars of the Milky Way; between galaxies |
| interlude | light entertainment in the midst of serious activities; a "break." |
| intermediary | one who acts as a mediator between persons. |
| interim | the time between periods or events |
| aloof | describes someone who is reserved in manner; uninvolved. |
| cerebral | of or relating to the brain; an intellectual. |
| ludus | to play |
| galactos | milk |
| venio, ventum | to come |
| ago, actum | to act, perform |
| jacio, jactum | to throw |
| natio | nation, race, kindred |