accreditation
noun [ U ]
uk/əˌkredɪˈteɪʃən/ usif something has accreditation, it is officially accepted as being of a particular standard:
gain/get/receive accreditation The law school hopes to gain full accreditation from the American Bar Association.
keep/lose accreditation The school district lost its accreditation last year and faces a state takeover in June if test scores fail to improve.