Correct spelling, explanation: the origin of the word conjure has its origin in the Latin form conjurare, which started as a combination of two other Latin words, namely, con and jurare. Together they used to have the meaning to conspire, often by oath. The word appeared in Old French, too, and then conjure entered Middle English, but its meaning was to oblige by oath.

Definition of conjure:
1. verb – When something happens as if by the use of magic powers;
He tried to conjure a dove from his hat many times, but he always failed.

Idioms and phrasal verbs with conjure:
The most common idioms and phrasal verbs with conjure are:
1. be a name to conjure with – refers to an important name that gives us the image of something nice and exciting;
In the USA Barack Obama is still a name to conjure with.
2. conjure up something – to have a mental image of something, to think of something;
While writing an exam try to conjure up the day you find out that you’ve passed.

Incorrect spelling, explanation: the word conjure looks French, which is no wonder as it has French origins. However, as a result of that, many people pronounce it wrongly with a French accent and spell it as conjour because conjure looks similar to a common French word bonjour. The correct pronunciation of the word, however, is /ˈkʌn.dʒər/ and the spelling is conjure.