from The Century Dictionary.
- noun One who favors political federation; specifically, one who advocates the establishment of a federal union among the parts of the British empire.
Sorry, no etymologies found.
In this way we will have a decentralized economy which will dispense with the State as we know it today and will be federationist in character....
The first cabinet was led by Edmund Barton, ardent federationist and protectionist.
While I have lived there under the autonomous government that rules it, I am an ardent federationist, and I believe that long ago we ought to have come into federation with this country.