Idoneus homo.—A fit man.

Ignoramus.—We are ignorant.

Ignorantia legis neminem excusat.—Ignorance of the law excuses no one.

Il a le diable au corps.—The devil is in him.

Imitatores, servum pecus.—Imitators, a servile herd.

Imperium in imperio.—One government existing within another.

Impransus.—One who has not dined.

Imprimatur.—Let it be printed.

Imprimis.—In the first place.

Impromptu.—A prompt remark without study.