1
: physical strength : force
—used in the phrase with might and main
The next instant we were away down the river, clawing with might and main to keep out of the woods.—Mark Twain
3
: the chief part : essential point
they are in the main well-trained
4
: a pipe, duct, or circuit which carries the combined flow of tributary branches of a utility system
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Merriam-Webster unabridged
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