by, through; the suffix of the prolative, determines the channel by which something takes place.
köken: From Proto-Finnic *-ic'ëC, consisting of the suffix *-icci plus an additional consonant. The additional consonant is found in Finnish, Ingrian and Votic; most other Finnic languages have forms deriving from the vowel-final form. Cognate with Estonian -itsi, Karelian -ičči, Veps -iči, Ingrian -itse, Votic -ze.
köken: From suffixed noun ért, éret (“instead of sth., in exchange”), evolved from *ér (“presumably "place"”), a noun of unknown origin extended with -t (“locative suffix”).
from, away from, out of · down from · (source of action or event) by, by means of
köken: Etymology tree Proto-Indo-European *h₂ep Proto-Indo-European *-o Proto-Indo-European *h₂epó Proto-Italic *ap Latin ab From Proto-Italic *ap, from Proto-Indo-European *h₂epó (“off, away”). The reconstruction of the Proto-Italic form is somewhat uncertain, as it's not clear when or how the final vowel of the PIE form was lost. The voicing of the final consonant to -b can be interpreted as an…
Gallos ab Aquitanis Garumna flumen, a Belgis Matrona et Sequana dividit.