Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old French
Origin: somondre, from Latin summonere 'to remind secretly', from sub- 'secretly' + monere 'to warn'

summon

 verb
     
sum‧mon [transitive] formal
1 to order someone to come to a place:
Robert summoned the waiter for the bill.
summon somebody to something
The president summoned Taylor to Washington.
summon somebody to do something
He was summoned to attend an emergency meeting.
2 to officially order someone to come to a court of law:
Hugh was summoned to appear before the magistrate.
3 also summon something up to try very hard to have enough of something such as courage, energy, or strength, because you need it:
He had to summon the energy to finish the race.
4

summon a meeting/conference etc

to arrange for a meeting to take place and order people to come to it [= convene]:
He summoned a meeting of business leaders.

summon up something

phrasal verb
1 if something summons up a memory, thought, or image, it makes you remember it or think of it [= conjure up]:
The smell summoned up memories of family holidays by the sea.
2 to try very hard to have enough courage, energy, or strength, because you need it:
Ruth took a deep breath, summoned up her courage, and told him the truth.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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