Definition of K-12 adjective from the Oxford Advanced Learner's Dictionary

 

K-12

 adjective
adjective
BrE BrE//ˌkeɪ ˈtwelv//
 
; NAmE NAmE//ˌkeɪ ˈtwelv//
 
Exams and assessment, Types of school
 
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(in the US) relating to education from kindergarten (= the class that prepares children for school) to 12th grade See related entries: Exams and assessment, Types of school
See the Oxford Advanced American Dictionary entry: K-12