The Collaborative International Dictionary
Frequentative \Fre*quent"a*tive\,
[L. frequentativus: cf. F. fr['e]quentatif.] (Gram.) Serving to express the frequent repetition of an action; as, a frequentative ver
-- n. A frequentative verb.
Douglas Harper's Etymology Dictionary
"verb which expresses repetition of action," 1520s, from French fréquentatif, from Late Latin frequentativus "serving to denote the repetition of an act," from Latin frequentat-, past participle stem of frequentare "visit regularly; do frequently, repeat," from frequentem (see frequent (adj.)).
Wiktionary
a. (context grammar English) Serving to express repetition of an action. n. (context grammar English) Refers to a subclass of imperfective aspect verbs that denote a repeated action, no longer productive in English, but found in e.g. Finnish, Latin, Russian, and Turkish.
Wikipedia
In grammar, a frequentative form ( abbreviated freq. or fr.) of a word is one that indicates repeated action. The frequentative form can be considered a separate but not completely independent word called a frequentative. The frequentative is no longer productive in English, but it still is some languages, such as Finno-Ugric languages ( Finnish or Hungarian), Balto-Slavic ( Lithuanian, Russian and Polish), Turkic etc.,