English
interregimental
From inter- + regimental.
Formed from inter- + regimental
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Today it means
adj Between regiments.
Language periods are conventional ranges, not dates for this word.
Etymograph / interregimental