English
intertrade
From inter- + trade.
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Proto-Indo-European *dreh₂- ‘to tread, walk, run’
…
Proto-West Germanic *tradu
Old Saxon trada ‘spoor, track’
Middle Low German trade ‘track, course’
Middle English trade ‘path, course of conduct’
English trade
Today it means
verb To trade with each other; to engage in mutual trading.
Language periods are conventional ranges, not dates for this word.
Etymograph / intertrade