1. most important; principal. see synonyms at chief.
2. exerted to the utmost; sheer: by main strength.
3. nautical connected to or located near the mainmast: a main skysail.
4. grammar of, relating to, or being the principal clause or verb of a complex sentence.
5. obsolete of or relating to a continuous area or stretch, as of land or water.
6. the chief or largest part: his ideas are, in the main, impractical.
7. the principal pipe or conduit in a system for conveying water, gas, oil, or other utility.
8. physical strength: fought with might and main.
9. A mainland.
10. the open ocean.
11. nautical A mainsail.
12. nautical A mainmast.

1. great in size or degree; vast; strong; powerful; important.
2. principal or chief in size or extent; largest; consisting of the largest part; most important by reason or size or strength.
3. belonging to or connected with the principal mast in a vessel.
4. big; angry.
5. very; very much; greatly; mightily; extremely; exceedingly.
6. that which is chief or principal; the chief or main portion; the gross; the bulk; the greater part.

1. very or extremely strong.
2. vast; huge.
3. unqualified; absolute; entire; sheer.
4. principal; chief; first in size, rank, importance, etc..
5. important; necessary.
6. very; extremely.
7. A hand or match at dice.
8. A stake played for at dice.
9. the largest throw in a match at dice; a throw at dice within given limits, as in the game of hazard.
10. A match at cockfighting.
11. A main-hamper.
12. strength; force; might; violent effort.
13. the chief or principal part; the main or most important thing.
14.
15. the great sea, as distinguished from an arm, bay, etc. ; the high sea; the ocean.
16. the continent, as distinguished from an island; the mainland.
17. principal duct or pipe, as distinguished from lesser ones; esp. (Engin.), a principal pipe leading to or from a reservoir.

1. great in size or degree; vast; hence, strong; powerful; important.
2. principal; prime; chief; leading; of chief or principal importance: as, his main effort was to please.
3. principal or chief in size or extent; largest; consisting of the largest part; most important by reason of size or strength: as, the main timbers of a building; the main branch of a river; the main body of an army.
4. full; undivided; sheer: now used chiefly in the phrases main strength, main force.
5. nautical, belonging to or connected with the principal mast in a vessel.
6. “big”; angry.
7. mightily; exceedingly; extremely.
8. to furl: said of sails.
9. an obsolete variant of maim.
10. strength; force; violent effort: now used chiefly in the phrase with might and main.
11. that which is chief or principal; the chief or main portion; the gross; the bulk; the greater part.
12.
13. the principal point; that which is of most importance; the chief or principal object, aim, or effort.
14. A broad expanse, as of space or light; unbroken extent; full sweep or stretch.
15. now, specifically
16. the expanse of ocean; the open ocean; the high sea.
17. A continental stretch of land; a continent; the maiuland, as distinguished from islands.
18. A principal duct, channel, pipe, or electrical conductor, as a water- or gas-pipe running along a street in a town, or the largest conductor in a system of electric lights.
19. the thick part of meat.
20. A hand.
21. . A hand at dice; a throw of the dice at hazard.
22. A match at cock-fighting.
23. A banker's shovel for coin.

1. any very large body of (salt) water
2. (of a clause) capable of standing syntactically alone as a complete sentence
3. a principal pipe in a system that distributes water or gas or electricity or that collects sewage
4. of force; of the greatest possible intensity
5. most important element