§113. niger, nigra, nigrum, black
The following nine adjectives with their compounds have the Genitive Singular in -īus and the Dative in -ī in all genders:
| alius (N. aliud), other. | tōtus, whole. | alter, -terīus, the other. |
| nūllus, no, none. | ūllus, any. | neuter, -trīus, neither. |
| sōlus, alone. | ūnus, one. | uter, -trīus, which (of two). |
Of these the singular is thus declined:—
| M. | F. | N. | M. | F. | N. | |
| NOM. | ūnus | ūna | ūnum | uter | utra | utrum |
| GEN. | ūnīus | ūnīus | ūnīus | utrīus | utrīus | utrīus |
| DAT. | ūnī | ūnī | ūnī | utrī | utrī | utrī |
| ACC. | ūnum | ūnam | ūnum | utrum | utram | utrum |
| ABL. | ūnō | ūnā | ūnō | utrō | utrā | utrō |
| NOM. | alius | alia | aliud | alter | altera | alterum |
| GEN. | alīus | alīus | alīus | alterīus | alterīus | alterīus |
| DAT. | aliī | aliī | aliī | alterī | alterī | alterī |
| ACC. | alium | aliam | aliud | alterum | alteram | alterum |
| ABL. | aliō | aliā | aliō | alterō | alterā | alterō |
a. The plural of these words is regular, like that of bonus (§ 110).
b. The genitive in -īus, dative in -ī, and neuter in -d are pronominal in origin (cf. illīus, illī, illud, and § 146).
c. The i of the genitive ending -īus, though originally long, may be made short in verse; so often in alterius and regularly in utriusque.
d. Instead of alīus, alterīus is commonly used, or in the possessive sense the adjective aliēnus, belonging to another, another's.
e. In compounds—as alteruter—sometimes both parts are declined, sometimes only the latter. Thus, alterī utrī or alterutrī, to one of the two.
J. H. Allen and J. B. Greenough, New Latin Grammar (Boston: Ginn, 1903). Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities.