1. To earnestly request something from someone; such as, to ask for aid or protection: Susan invoked her brother’s help for assistance in changing the tires on her car.
2. To quote, to rely on, or to use something; such as, a law in support of an argument or case: The chairman of the committee invoked the principle of helping and protecting the refugees in their town as much as possible.
3. To create, or to arouse, an idea, emotion, or image: Some music by Beethoven evokes the feeling of being in a wide open field or meadow.
4. To call upon an evil spirit to appear; such as, by casting a spell: In the children's story, the old hag invoked magical words which turned the prince into a frog!