A "certified teacher" is a teacher who has completed the necessary training, education, and requirements set by their country or state to meet certain standards in teaching. Full definition
I am a national board certified teacher with full certification in biology and art. (ncpolicywatch.com)
The chronic and increasing shortage of fully certified teachers in special and general education. (caldercenter.org)
And even though there is some evidence that native children, like other minorities, learn better when taught by certified teachers of their own race, finding such teachers is particularly difficult. (hechingerreport.org)