federalist

noun3

1. •
   Advocate of federalism.
2. •
   (Canada) Supporter of the view that the province of Québec should remain within the Canadian federal system; an opponent of Québec‐based separatism or sovereigns.
3. •
   A covenantalist.

adjective1

1. •
   Of or relating to federalism, or its advocates.

noun1

1. •
   (US, historical) A member of the Federalist Party, an 18th- and 19th-century conservative, liberal US political party which was one of two major parties under the First Party System.

   • No good Federalist has at present any wish to shake the fair and stately pillars of its fabric, and o'er its lamented ruins to erect the frightful columns of uncouth monarchy. — 1800