early 15c., peregrinacioun, "a journey, pilgrimage," hence, later, "roaming or wandering about in general," from Old French peregrination "pilgrimage, long absence" (12c.) or directly from Latin peregrinationem (nominative peregrinatio) "a journey, a sojourn abroad," noun of action from past-participle stem of peregrinari "to journey or travel abroad," figuratively "to roam about, wander," from peregrinus "from foreign parts, foreigner," from peregre (adv.) "abroad," properly "from abroad, found outside Roman territory," from per "away" (see per) + agri, locative of ager "field, territory, land, country" (from PIE root *agro- "field"). The earlier English word was peregrinage (mid-14c.).