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Webster 1913 Edition

Adj.

Between or among colonies; pertaining to the intercourse or mutual relations of colonies;

as,

intercolonial

trade

–

Inˊter-co-lo′ni-al-ly

adv.

intercolonial ‎(not comparable)

Between colonies
- 1894, Ivan Dexter, Talmud: A Strange Narrative of Central Australia, published in serial form in Port Adelaide News and Lefevre's Peninsula Advertiser (SA), Chapter XVIII,
  […] in 1858 I shipped on an intercolonial vessel, under engagement to proceed to the Swan River settlement.

between colonies

intercolonial m ‎(feminine singular intercoloniale, masculine plural intercoloniaux, feminine plural intercoloniales)