## EnglishEdit

### EtymologyEdit

### NounEdit

**counion** (*plural* **counions**)

- (mathematics)
*This word needs a definition. Please help out and***add a definition,**then remove the text`{{rfdef}}`

.**1986**, Yves Diers,*Categories of Boolean sheaves of simple algebras*- the left adjoint […] preserves direct factors, their cointersections, their complements and thus their
**counions**

- the left adjoint […] preserves direct factors, their cointersections, their complements and thus their