(of a person, organization, or course of study) officially recognized or authorized

an accredited practitioner

an accredited college

give credit to (someone) for something

he was accredited with being one of the world's fastest sprinters

(of an official body) give authority or sanction to (someone or something) when recognized standards have been met

institutions that do not meet the standards will not be accredited for teacher training

give official authorization for (someone, typically a diplomat or journalist) to be in a particular place or to hold a particular post

no journalist accredited to the UN has ever been expelled