"main : Of chief or leading importance; prime, principal. Chief, most important, or principal in..."

“main : Of chief or leading importance; prime, principal.
Chief, most important, or principal in extent, size, or strength; consisting of the largest part.
Of force, strength, etc.: full, sheer, undivided.
(dialectal) Big; angry.
(nautical) Belonging to or connected with the principal mast in a vessel.
(obsolete) Great in size or degree; important, powerful, strong, vast.”

- https://en.wiktionary.org/wiki/main#English

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