From the Latin for "to close", it's the alignment & spacing of your upper & lower teeth when you bite
[DOC] [TLE] FAQs - Glossary - SmartSmiles Orthodontics [PAR] A malocclusion with the upper front teeth protruding or due to the lower teeth ... 
Lower anterior (front) teeth are I crossbite if they erupt and function in front of the 
... bands are worn to provide individual tooth movement or jaw alignment.