Meaning of “megapixel” - Learner’s Dictionary

megapixel

noun [ C ] uk us /ˈmeɡəˌpɪksəl/

one million pixels (= small points that form part of the image on a computer screen), used to describe the amount of detail in images made by a digital camera, computer screen, etc

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