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English definition of “main”

main

adjective [not gradable]  /meɪn/ us  

main adjective [not gradable] (MOST IMPORTANT)

most important or larger: The main thing is to keep calm and don’t get angry. The main social event of the summer was a dance and reception.

main

noun [C]  /meɪn/ us  

main noun [C] (PIPE)

a large pipe that is part of the system carrying water or gas from one place to another: A water main burst and flooded the street.
(Definition of main from the Cambridge Academic Content Dictionary © Cambridge University Press)
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