from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Intransitive and having an agent as its subject.
- n. An unergative verb.
un- + ergative, from the fact that in an ergative-absolutive language, the only case which uniquely identifies a volitional argument is the ergative case, which marks the agent of a transitive verb. (Wiktionary)
Even Lemnian, related to Etruscan, shows the same unergative usage of the s-genitive avis 'of the year/age', Hulaies 'of Hulaie', śialχveis 'of 60'