1 main /ˈmeɪn/ adjective
1 main
Learner's definition of MAIN
always used before a noun
: most important : chief, principal

— mainly

2 main /ˈmeɪn/ noun
plural mains
2 main
plural mains
Learner's definition of MAIN
[count] : the largest pipe in a system of connected pipes
the mains British
: the system of pipes or wires for electricity, gas, or water
often used as mains before another noun
: the place where electricity, gas, or water enters a building or room

in the main

: in general used to say that a statement is true in most cases or at most times
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