### EtymologyEdit

*explement* + *-ary*

### AdjectiveEdit

**explementary** (*not comparable*)

- (geometry) Of or relating to the explement.
**2002**, Nathaniel Bowditch, *American Practical Navigator* (page 317)
- Two angles whose sum is a circle (360°) are
**explementary** angles, and either is the explement of the other.