Learn how to say Diploma correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word diploma:
1a certificate awarded by an educational establishment to show that someone has successfully completed a course of study.
2 historical an official document or charter.
mid 17th century (in the sense ‘state paper’): via Latin from Greek diplōma ‘folded paper’, from diploun ‘to fold’, from diplous ‘double’