From -tō, although the appearance of -i- when affixed to first conjugation verbs has not been explained.
- Forms frequentative verbs from existing verbs.
Unlike -tō, this suffix is attached to the present stem of the verb. The vowel of the suffix replaces any final vowel of the stem, thus cantā- > cant-itā-. It is often found suffixed to first conjugation verbs, including existing frequentatives in -tō, but some examples from other conjugations also exist, such as agō > agitō.