The verb invoke has 3 senses (first 2 from tagged texts)
1. (6) raise, conjure, conjure up, invoke, evoke, stir, call down, arouse, bring up, put forward, call forth -- (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")
2. (4) invoke, appeal -- (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")
3. appeal, invoke -- (request earnestly (something from somebody); ask for aid or protection; "appeal to somebody for help"; "Invoke God in times of trouble")