English

interarmy

From inter- + army.

Formed from inter- + army

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *h₂er- ‘to join, fit together’

…

Latin armō ‘to arm’

Medieval Latin armāta ‘armed force’

Old French armee

Middle English armee

English army

Today it means

adj Between armies.

Language periods are conventional ranges, not dates for this word.

Etymograph / interarmy