Third (Declension) I-Stem Nouns

List of third declension i-stem nouns and how to decline them.

Gender Endings

♚ Masculine/♛ Feminine
Rules to Recognize M/F i-stem.
  1. Parasyllabics with nominatives -is/-es
    • hostis, hostis, m. -> 2 syllables
    • nubes, nubis, f. -> 2 syllables
  2. Nominatives ending in -s/-x => Stem with 2 consonants
    • urbs, urbis, f.
    • nox, noctis, f.
♜ Neuter
Rules to Recognize Neuter i-stem.
  1. Nominatives ending in -al/-ar/-e
    • animal, animalis, n.
    • mare, maris, n.
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Declension Chart

Masculine/Feminine Neuter
Nom. - -
Gen. -is -is
Dat.
Acc. -em -
Abl. -e
Voc. - -
Nom. -es -ia
Gen. -ium -ium
Dat. -ibus -ibus
Acc. -es -ia
Abl. -ibus -ibus
Voc. -es -ia

Declension Chart for Irregular vīs, vīs, f.

Singular Plural
Nom. vīs vīrēs
Gen. vīs vīrium
Dat. vīribus
Acc. vim vīrēs
Abl. vīribus
Voc. - -

List of Third (Declension) I-Stem Nouns

Term Definition Derivatives
animal, animālis, n. a living creature, animal -
ars, artis, f. art, skill artifact, artifice, artificial, artisan, artist, inert
auris, auris, f. ear aural, auricle, auricular, auricular, auriform
cīvis, cīvis, m. and f. citizen civic, civil, civilian, civility, civilize
mare, maris, n. sea marine, mariner, marinate, maritime, submarine, cormorant, rosemary
mors, mortis, f. death mortal, immortal, mortify, mortgage; murder
nūbēs, nūbis, f. cloud nubilous, nubilose, nuance
pars, partis, f. part, share, direction party, partial, partake, participate, participle, particle, particular, partisan, partition, apart, apartment, depart
urbs, urbis, f. city urbsn, urbane, urbanity, surburb, suburban
vīs, vīs, f. force, power, violence vim, violate, violent
vīrēs, vīrium, pl. f. strength vim, violate, violent
mīlia, mīlium, n. pl. thousands millennium, mile, milligram, millimeter, millipede, million
aetās, aetātis, f. period of life, life, age, an age, time eternal, eternity, sempiternal
hostis, hostis, m. an enemy (of the state) hostile, hostily, host
finis, finis, m. end, limit, boundary; purpose affinity, confine, define, final, finale, finance, fine, finesse, finial, finicky, finish, finite, infinite, paraffin, refine
finēs, finium, m. boundaries, territory affinity, confine, define, final, finale, finance, fine, finesse, finial, finicky, finish, finite, infinite, paraffin, refine
nāvis, nāvis, f. ship, boat naval, navy, navigate, nave
ignis, ignis, m. fire igneous, ignite, ignition