Review of Noun Forms

The vocabulary information for nouns is: nominative, genitive, gender.

Note:
The genitive tells you which declension a noun is.
The genitive also tells you the base for declining the other case forms.  The base is the genitive minus the genitive ending.

1st declension:  (-a stem)  genitive: -ae

  • -a, -ae  (feminine unless =  male person: agricola, incola, nauta)
  • suffixes:  -ia, -iae;  -tia, -tiae  (abstract nouns)

2nd declension:  (-o stem): genitive -ī 

  • -us or –(e)r,  –ī   masculine (except trees are feminine)          
  • -um, –ī  neuter

3rd declension: (consonant and *–i stems); genitive sing. -is

Note: The nominative is either the stem (always for neuter) or add –s (usually feminine)
The genitive also tells you the base for declining the other case forms.  The base is the genitive minus the genitive ending.
  • nominative –r,   masculine (unless female person: māter, uxor)
                       common suffixes:  -or, -ōris  (abstract emotion) (timor, dolor)
                                                    -tor, -tōris  (person)
  • nominative -s, feminine  (except –us = neuter, see below)
                       often stems in –t or –d, which drop the –t/-d before the –s       
                               nom.  (ar-s, art-is; mēn-s, ment-is)
                       suffixes:  -tās, -tātis  (abstract)  (cīvitās, vēritās, lībertās)
  • nominative –ō, usually feminine
                       often stems in –n (with the –n dropped in the nom.)
                       common patterns:  -ō, -inis  (cf. homō, hominis, m/f)
                       -tiō/-siō, -iōnis  (from 4th princ. part of verb) (abstract noun: “a ___ing”)  (ratiō)
  • nominative –x, (usually feminine)
                       stems in –c or –g  (+ -s gives –x for nom.)
                                 e.g.: rēx, rēgis (m.); lūx, lūcis; vox, vōcis
  • nominative –us, neuter  (remember: the –us is the stem, not the ending; the –s changed to –r- between vowels)
                                 genitive:  -or-is or –er-is  (corpus, tempus; opus) 
                                         (a vowel rounds before -r , so u > o;  nom. -us,  base -or)
  • nominative –men, neuter 
                                 genitive: min-is  (base min-) (nōmen; flūmen)
  • *-i stem: genitive plural: -ium (neuter: abl. sing. –ī; nom./acc.pl. –ia)
              monosyllabic nominative with stem ending in two consonants: dēns, dent-is; mons, mont-is
              nominative = genitive: hostis, hostis, c. 

4th declension: (-u stem): genitive –ūs  

  • -us, -ūs, masculine (except: domus and manus are fem.)
    • often < 4th principal part of verb
  • -ū, -ūs,  neuter

5th Declension: (-e stem): genitive -eī (or –ēī after a vowel) 

  • ēs, -eī, feminine (except: diēs,  day, usually masculine unless it refers to a special day)