| 1. | chief in size, extent, or importance; principal; leading: the company's main office; the main features of a plan. |
| 2. | sheer; utmost, as strength or force: to lift a stone by main force. |
| 3. | of or pertaining to a broad expanse: main sea. |
| 4. | Grammar. syntactically independent; capable of use in isolation. Compare dependent (def. 4), independent (def. 14), main clause. |
| 5. | Nautical.
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| 6. | Obsolete.
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| 7. | a principal pipe or duct in a system used to distribute water, gas, etc. |
| 8. | physical strength, power, or force: to struggle with might and main. |
| 9. | the chief or principal part or point: The main of their investments was lost during the war. |
| 10. | Literary. the open ocean; high sea: the bounding main. |
| 11. | the mainland. |
| 12. | South Midland U.S. (chiefly Appalachian ). very; exceedingly: The dogs treed a main big coon. |
| 13. | Slang. mainline. |
| 14. | in the main, for the most part; chiefly: In the main, the novel was dull reading. |

main (mān) adj.
[Middle English, from Old English mægen, strength; see magh- in Indo-European roots.] |
main
In addition to the idioms beginning with main, also see eye to the main chance; in the main; might and main.