| ignis | fire |  | ign- | ignis | igneous, ignite, ignition |
| imber | heavy rain |  | imbr- | imber, imbris | ignimbrite, imbrex, imbricate, imbrication, imbriferous |
| imāgō | copy |  | imagin- | imāgō, imāginis | image, imagine |
| in- | not, un- (negation) |  | in- (2), il-, im-, ir- | in- | illicit, impossible, inimical, insane, irrational |
| inanitio | empty, vain |  | inan- | inanitio emptiness and inanitas worthlessness, from inanire to empty, from inanis empty, void, worthless | inane, inanition, inanity |
| infra | below, under |  | infra- | infra | infrared, infrastructure |
| insula | island |  | insul- | insula | insular, insulation |
| inter | among, between |  | inter- | inter (preposition) | intercollegiate, intermission, intersection |
| intra | inside , within |  | intra- | intra | intramural, intravenous |
| in | in, on |  | in- (1), il-, im- | in | illuminate, import, incur, intend, invite |
| irasci | be angry |  | irasc-, irat- | irasci grow angry, from ira anger | irascible, irate, ire |
| iris | rainbow |  | irid- | iris | iridescent |
| iterum | again |  | iter- | iterum, iterare | iteration |
| iter | journey |  | itiner- | iter, itineris | itinerary |
| teg | whole, complete |  | integr- | in-, teg- | integrate, integration, integer, integrational, disintegrate, integral, unintegrated |
