semigroup
noun
semi·group ˈse-mē-ˌgrüp 
ˈse-ˌmī-,
-mi-
: a mathematical set that is closed under an associative binary operation
Word History
First Known Use
1904, in the meaning defined above
- undergods
- undergoer
- undergoes
- undergoing
- undergone
- undergown
- undergowns
- undergrad
- undergrade
- undergrads
- undergraduate
- undergraduates
- undergraduateship
- undergraduette
- undergraduettes
- undergreen
- undergroom
- underground
- Underground Railroad
- underground railway
- undergrounder
- undergrounders
- undergrounds
- undergrove
- undergroves