11-plus 11-plus /ˌɛlɛvən ˈplʌs/

noun

1. [Archaic, UK] An examination taken by 11 and 12 year old students to select suitable candidates for grammar school  ( 11-plus [Archaic, UK] , eleven-plus [Archaic, UK] )
   an examination taken by 11 and 12 year old students to select suitable candidates for grammar school