While the words that spring from it are mostly technical in nature, here, nonetheless, if you can use it, is a worksheet on the Greek word root meso; it will most likely show up in the noun Mesoamerica or the adjective Mesoamerican in most classrooms. In any case, it means middle.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.