English
interimperial
From inter- + imperial.
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Proto-Indo-European *perh₃- ‘to grant’
…
Latin imperium ‘empire, imperial government’
Latin imperiālis ‘of the empire or emperor, imperial’
Old French imperial
Middle English imperial
English imperial
Today it means
adj Between empires.
Language periods are conventional ranges, not dates for this word.
Etymograph / interimperial