PIE base ‘to lead, pass over’, a verbal root belonging to the group of per-¹.
Derivatives include important, opportunity, welfare, farewell, practical, portfolio, sport, support, transport, porter, harbour, fern, ferry, firth, and fjord.
[Pokorny *per-2: B. per-, perə- ‘to carry over, bring; to go over, fare’, p. 816–817.]
Glossary terms for this common ancestor to be added.