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The aktionsart (pronounced [akˈtsi̯oːnsˌʔaɐ̯t], plural aktionsarten [akˈtsi̯oːnsˌʔaɐtn̩]) or lexical aspect of a verb is a part of the way in which that verb is structured in relation to time. Any event, state, process, or action a verb expresses—collectively, any eventuality—may also be said to have the same aktionsart. Lexical aspect should be distinguished from grammatical aspect: lexical aspect is a classification of verbs. Grammatical aspect is a classification of different (conjugated) forms of a single verb.

For example, eat an apple differs from sit in that there is a natural endpoint or conclusion to eating an apple. There is a time at which the eating is finished, completed, or all done. By contrast, sitting can merely stop: unless we add more details, it makes no sense to say that someone finished sitting. This is a distinction of lexical aspect between the two verbs. Verbs that have natural endpoints are called telic (from Ancient Greek telos, end); those without are called atelic.

Zeno Vendler (1957) classified verbs into four categories: those that express ‘activity’, ‘accomplishment’, ‘achievement’ and ‘state’. Activities and accomplishments are distinguished from achievements and states in that the former allow the use of continuous tenses. Activities and accomplishments are distinguished from each other by boundedness: activities do not have a terminal point (a point before which the activity cannot be said to have taken place, and after which the activity cannot continue – for example ‘John drew a circle’) whereas accomplishments do. Of achievements and states, achievements are instantaneous whereas states are durative.

In his discussion of Aktionsarten, Comrie (1976) included the category ‘semelfactive’. His divisions of the categories are as follows: states, activities, and accomplishments are durative, while semelfactives and achievements are punctual. Of the durative verbs, states are unique as they involve no change, and activities are atelic (that is, have no ‘terminal point’) whereas accomplishments are telic. Of the punctual verbs, semelfactives are atelic, and achievements are telic. The following table exemplifies examples of Aktionsart in English that involve change (an example of a State is 'know').

• Grammatical aspect
• Predicate

• Binnick, R. I. (1991) Time and the Verb: A Guide to Tense & Aspect. Oxford: Oxford University Press. ISBN 0-19-506206-X
• Comrie, B. (1976) Aspect: An Introduction to the Study of Verbal Aspect and Related Problems. Cambridge: Cambridge University Press. ISBN 0-521-21109-3
• Vendler, Z. (1957) Verbs and Times, The Philosophical Review 66:143-60. ISSN 0031-8108

• De Swart, H. and Verkuyl, H. (1999) Tense and Aspect in Sentence and Discourse. Reader, ESSLLI summer school, Utrecht. Aug. 9-13, 1999.
• Moens, M. (1987) Tense, Aspect and Temporal Reference. PhD Thesis, Centre for Cognitive Science, University of Edinburgh.
• Smith, C. S. (1997) The Parameter of Aspect (2nd ed). Dordrecht: Kluwer Academic Publishers.
• Verkuyl, H. J. (1993) A Theory of Aspectuality: The interaction between temporal and atemporal structure. Cambridge: Cambridge University Press.