<p><strong>Adjective:</strong></p><ul><li>Chief in size, extent, or importance; principal; leading: the company's main office; the main features of a plan.</li><li>Sheer; utmost, as strength or force: to lift a stone by main force.</li><li>Of or relating to a broad expanse: main sea.</li><li>Syntactically independent; capable of use in isolation.</li><li>Of or relating to a mainmast.</li><li>Noting or pertaining to a sail, yard, boom, etc., or to any rigging belonging to a mainmast.</li><li>Having or exerting great strength or force; mighty.</li><li>Having momentous or important results; significant.</li></ul><p><strong>Synonyms:</strong></p><ul><li>Capital</li><li>Primary</li><li>Paramount</li><li>Prime</li><li>Cardinal</li></ul><p><strong>Antonyms:</strong></p><ul><li>Least</li><li>Secondary</li></ul><p><strong>Noun:</strong></p><ul><li>A principal pipe or duct in a system used to distribute water, gas, etc.</li><li>Physical strength, power, or force: to struggle with might and main.</li><li>The chief or principal part or point: The main of their investments was lost during the war.</li><li>The open ocean; high sea: the bounding main; the mainland.</li><li>A main course in a meal: The restaurant offers four mains: one chicken, two beef, and one fish.</li></ul><p><strong>Adverb:</strong></p><ul><li>Very; exceedingly: The dogs treed a main big coon.</li></ul><p><strong>Verb:</strong></p><ul><li>Slang: mainline.</li></ul>