mot \mot\ m=ot, v. sing. pres. ind. mot, mote, moot
   m=ot, pl. mot, mote, moote, pres. subj. mote;
   imp. moste. see must, v. obs.
   may; must; might.
   1913 webster

         he moot as well say one word as another  --chaucer.
   1913 webster

         the wordes mote be cousin to the deed.   --chaucer.
   1913 webster

         men moot i.e., one only give silver to the poore
         freres.                                  --chaucer.
   1913 webster

   so mote it be, so be it; amen; -- a phrase in some rituals,
      as that of the freemasons.
      1913 webster
see also:
mot mote moot moote moste must 
so mote it be