Source : Webster's Revised Unabridged Dictionary (1913)

Summoner \Sum"mon*er\, n. [OE. somner, sompnour, OF. semoneor,
   F. semonneur. See {Summon}, v. t.]
   One who summons; one who cites by authority; specifically, a
   petty officer formerly employed to summon persons to appear
   in court; an apparitor.