A summoner can refer to different things depending on the context. Here are some possible meanings:

• Magic and religion: A summoner is a person who practices evocation, the act of calling upon or summoning a spirit or deity.
• Ecclesiastical court official: In medieval England and Scotland, a summoner was a minor official (not a cleric) who summoned people before the ecclesiastical courts. Summoners acquired inquisitorial powers and were responsible for delivering summonses to those accused of spiritual crimes, such as adultery or heresy.
• Legal contexts: A summoner is someone who summons or evokes, particularly in legal contexts.
• Bell: A summoner can also refer to a small bell used to summon an employee to provide service.

Its worth noting that the term "summoner" has been used in literature, such as in Geoffrey Chaucers "The Canterbury Tales," where the Summoner is a character who calls people before the ecclesiastical court for their spiritual crimes.