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113. 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.

Note.--The regular genitive and dative forms (as in bonus ) are sometimes found in some of these words: as, genitive and dative feminine, aliae; dative masculine, aliō . Rare forms are alis and alid (for alius, aliud).

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