Starting from a definition of 'moment', the authoress develops a critique of previous aspectological approaches to momentary verbs and proposes a new definition of this class of verbs. The present approach allows for the heterogeneity of momentary verbs and their relation to Vendler's 'achievement' verbs (Vendler 1957). Further, the authoress discusses the terms of use of momentary verbs with durative expressions ('within an hour' type)., i.e., with adverbials denoting time spent in completing the action.