Reconstruction:Proto-Celtic/-mā

Etymology
From. Other apparent appearances of this suffix elsewhere in Indo-European include:
 * and, both of these from.
 * , from.

The first verbal noun with this suffix was likely.

Usage notes

 * Causative/iterative verbs, despite also being weak verbs in *-ī-, instead generally used to make verbal nouns.
 * This suffix was mildly productive in Goidelic, but in Brittonic it was very productive, ousting almost every other verbal noun formation, even.