The aspect of the verb that expresses the repetition of an action WordNet 3.0 & Open English WordNet

In linguistics, the iterative aspect, also called "semelfactive", "event-internal pluractionality", or "multiplicative", is a grammatical aspect that expresses the repetition of an event observable on one single occasion, as in 'he knocked on the door', 'he coughed', 'she is drumming', etc. Wikipedia

A verb showing the iterative aspect. Wiktionary

A subclass of imperfective verbs that denote a continuously repeated action. An example in English would be the iterative verb sniffle, as opposed to the noniterative sniff. Wiktionary

Subclass of imperfective verbs. Wiktionary (translation)