Definition of mast
1
:a long pole or spar rising from the keel or deck of a ship and supporting the yards, booms, and rigging
2
:a slender vertical or nearly vertical structure (such as an upright post in various cranes)
3
:a disciplinary proceeding at which the commanding officer of a naval unit hears and disposes of cases against enlisted men — called also
captain's mast
—
before the mast
1
:forward of the foremast
2
:as a common sailor
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