adj
main
mayn
adj
1
Most important; primary or chief.
"The main reason he quit was the long commute."
"What is the main course tonight?"
noun
1
A large pipe carrying water, gas, or electricity to a network of buildings.
"A burst water main flooded the street."
How to Use Main
Learner’s notesIn plain EnglishThe chief or most important one, or a supply pipe/cable feeding a whole area.
Common pairings
main reason
main course
water main
gas main
Word Forms
more main comparative, mains plural, mains plural, most main superlative
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The _____ reason he quit was the long commute.
Etymology
From Old English mægen ("strength, principal force"), related to the verb "may" in the sense of power or ability.