of -iī); as,--

_Nom._ ingenium fīlius
_Gen._ ingénī fīlī

These Genitives accent the penult, even when it is short.

3. Fīlius forms the Vocative Singular in -ī (for -ie); _viz_. fīlī, _O
son!_

4. Deus, _god_, lacks the Vocative Singular. The Plural is inflected as
follows:--

_Nom._ dī (deī)
_Gen._ deōrum (deum)
_Dat._ dīs (deīs)
_Acc._ deōs
_Voc._ dī (deī)
_Abl._ dīs (deīs)

5. The Locative Singular ends in -ī; as, Corinthī, _at Corinth_.

6. The Genitive Plural has -um, instead of -ōrum,--

a) in words denoting money and measure; as, talentum, _of talents_;
modium, _of pecks_; sēstertium, _of sesterces_.

b) in duumvir, triumvir, decemvir; as, duumvirum.

c) sometimes in other words; as, līberum, _of the children_; socium, _of