LATIN DICTIONARYLexicon Latīnum
suffix

-ī1

-ī
Classical[ˈiː]Ecclesiastical[ˈiː]

Meaning

  1. morphemegenitive/locative singular of -us for second-declension nouns.
  2. genitivemasculinemorphemeneutersingulargenitive masculine/neuter singular of -us for first/second-declension adjectives.
  3. femininegenitivemorphemesingularuncommongenitive feminine singular of -us for first/second-declension adjectives.
  4. genitivemorphemesingulargenitive singular of -os (Old Latin second-declension ending)
    loucos + -ī → loucī

Origins

Unknown. Compare Proto-Celtic *-ī (genitive singular ending). Displaced Proto-Italic -osjo (See Proto-Italic *-os.), which was descended from Proto-Indo-European -osyo. (See Proto-Indo-European *-os.)

suffix
-ī2
-ī
Classical[ˈiː]Ecclesiastical[ˈiː]

Meaning

  1. morphemeUsed for the first person present perfect singular form of any regular verb.

Origins

From Proto-Italic *-ai, from Proto-Indo-European *-h₂e.

Quick answers

What does -ī mean in Latin?
-ī, a suffix, means “genitive/locative singular of -us for second-declension nouns.; genitive masculine/neuter singular of -us for first/second-declension adjectives.; genitive feminine singular of -us for first/second-declension adjectives.”.
How do you pronounce -ī?
In classical Latin, [ˈiː]; in ecclesiastical (church) Latin, [ˈiː].