This is a verb-suffix, marking the infinitive of a "living" conjugation.

bourgau, civil.
abourgali, to civilize.

-ié (fem.).

Carestié, dearness, stands in contrast to the Italian carestia.

priva, to train, to tame.
privadié, sweet food given in training animals.

-ié (masc.), -iero (fem.).

This is the equivalent of the French -ier.

óulivié, olive tree.
bouchié, butcher.
pinatié, } a dwelling
pinatiero,} among pines.

-ièu (masc.), -ivo (fem.).

This is the form corresponding to the French -if, -ive.