Definition of "reson" [reson]

• A Middle English form of reason.
• A Middle English plural preterit of rise.

The Century Dictionary (Public Domain)

• "The main reson that the military was on the cutting edge back in the 1940s with integration and dragging its feet now is simple."
• "As already stated, the mercury is the main reson to limit your fish intake."
• "The main reson I want Clinton to win is because she is the more experinced of the two."