Source : Webster's Revised Unabridged Dictionary (1913)

Moste \Mos"te\, obs.
   imp. of {Mote}. --Chaucer.

Mot \Mot\ (m[=o]t), v. [Sing. pres. ind. {Mot}, {Mote}, {Moot}
   (m[=o]t), pl. {Mot}, {Mote}, {Moote}, pres. subj. {Mote};
   imp. {Moste}.] [See {Must}, v.] [Obs.]
   May; must; might.

         He moot as well say one word as another  --Chaucer.

         The wordes mote be cousin to the deed.   --Chaucer.

         Men moot [i.e., one only] give silver to the poore
         freres.                                  --Chaucer.

   {So mote it be}, so be it; amen; -- a phrase in some rituals,
      as that of the Freemasons.