Which word is not spelled correctly in the context of the following sentence? The itinerant teacher moved continually from one school to another within the district.

The word 'iterate' is not spelled correctly in the sentence. The correct word that should be used here is 'itinerant,' which means constantly traveling from place to place, especially for work. In this context, 'iterate' does not fit as it means to repeat a process or utterance. 'Continually' is spelled correctly and means happening without interruption. 'Within' and 'district' are also spelled correctly and are used appropriately in the sentence. Therefore, choice A is the correct answer.