57. 1. Used in only One Case. Many nouns of the Fourth Declension are found
only in the Ablative Singular as, jussū, _by the order_; injussū, _without
the order_; nātū, _by birth_.

2. Used in Two Cases.

a. Fors (_chance_), Nom. Sing.; forte, Abl. Sing.

b. Spontis (_free-will_), Gen. Sing.; sponte, Abl. Sing.

3. Used in Three Cases. Nēmō, _no one_ (Nom.), has also the Dat. nēminī and
the Acc. nēminem. The Gen. and Abl. are supplied by the corresponding cases
of nūllus; viz. nūllīus and nūllō.

4. Impetus has the Nom., Acc., and Abl. Sing., and the Nom. and Acc. Plu.;
viz. impetus, impetum, impetū, impetūs.


5. a. Precī, precem, prece, lacks the Nom. and Gen. Sing.

b. Vicis, vicem, vice, lacks the Nom. and Dat. Sing.

6. Opis, dapis, and frūgis,--all lack the Nom. Sing.

7. Many monosyllables of the Third Declension lack the Gen. Plu.: as, cor,
lūx, sōl, aes, ōs (ōris), rūs, sāl, tūs.

Indeclinable Nouns.

58. Here belong--