Meaning of “SASE” - Learner’s Dictionary

SASE

noun [ C ] uk us /ˌeseɪesˈiː/ US

abbreviation for self-addressed stamped envelope: an envelope that you put a stamp and your own address on and send to someone so that they can send you something back:

Please enclose a SASE with your payment.

(Definition of “SASE” from the Cambridge Learner’s Dictionary © Cambridge University Press)