oldcomer noun3 •An immigrant or the descendant of immigrants who has lived in their new environment long enough to become well-established.As has already been described, in the 'oldcomer' district, 'newcomers' are at times in the position of being helped by the established 'foreigners' of the community. — 2010 •One who has been acquainted with something for a long time; an established member of a group who is familiar with the group culture and resources.This profession has an important role to play in easing the tensions which often arise when newcomer meets oldcomer. — 1956 •A member of a therapeutic community who has achieved a trusted status and is assigned as a mentor to a newcomer.I am your oldcomer. I'll be in the room with you every minute that we're out of the building. You are a newcomer. You cannot be trusted. — 2017 formsoldcomers