What is "provection"

Provection \Pro*vec"tion\, n. [L. provectio an advancement.] (Philol.) A carrying forward, as of a final letter, to a following word; as, for example, a nickname for an ekename.

1650s, "advancement" (obs.); 1868 in the sense "carrying of the final letter of a word into the next one" (as in newt), from Late Latin provectionem (nominative provectio) "advancement," noun of action from past participle stem provehere "to carry forward," from pro- "toward, ahead" (see pro-) + vehere "to carry" (see vehicle).

n. (context linguistics English) The carrying forward of a final consonant to a following word, as in "nickname" for "an ekename".

Provection, according to The Gaelic of Arran by Nils Magnus Holmer refers to "the carrying over of the final consonant of a word to the following word". It is considered to be a "grammatic mutation" and is used a lot in Breton grammar.