I used this in 6th grade when I taught a unit on Geometry (was used with Chapter 5 in the 6th Grade Everyday Math series). When I taught a particular lesson I would have the students get out their dictionary and write the definition in their own words and draw a picture. We used this throughout the entire chapter. Students were instructed to study these definitions and had a quiz (included, too) at the end of the chapter. I have included 23 vocabulary words all together. (ex: angle, vertex, acute angle, supplementary angles, transversal, etc).