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summon into action or bring into existence, often as if by magic;
"raise the specter of unemployment"
"he conjured wild birds in the air"
"call down the spirits from the mountain"
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cite as an authority; resort to;
"He invoked the law that would save him"
"I appealed to the law of 1900"
"She invoked an ancient law"
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request earnestly (something from somebody); ask for aid or protection;
"appeal to somebody for help"
"Invoke God in times of trouble"