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A term originated from the Royal Air Force (RAF) during WW2. Used to address fellow members of a squadron.

Made famous in the movie "Dunkirk"
Fortis 1: Fortis 2, i've lost sight of Fortis leader, over.
Fortis 2. Understood, Fortis 1. Return to base.
by Proud_Deplorable January 13, 2018
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Aidan didn’t like the texture of fortis in his mouth
by Gregsdead September 14, 2018
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