[...] this work suggests that the aspectual notion of "telicity" figures in the characterization of the semantic underpinnings of the unaccusative/unergative distinction. The unaccusative class includes "telic" verbs (verbs denoting events with an inherent endpoint; primarily, change of state and location verbs), and the unergative class includes "atelic" verbs (verbs denoting events with no inherent endpoint; essentially, activity verbs).
- Levin (2004), Pag. 314