Princeton's WordNet

1. main, briny(noun)

   any very large body of (salt) water

2. main(adj)

   a principal pipe in a system that distributes water or gas or electricity or that collects sewage

3. chief(a), main(a), primary(a), principal(a), master(a)(adj)

   most important element

   "the chief aim of living"; "the main doors were of solid glass"; "the principal rivers of America"; "the principal example"; "policemen were primary targets"; "the master bedroom"; "a master switch"

4. independent, main(a)(adj)

   (of a clause) capable of standing syntactically alone as a complete sentence

   "the main (or independent) clause in a complex sentence has at least a subject and a verb"

5. main(a)(adj)

   of force; of the greatest possible intensity

   "by main strength"

Kernerman English Learner's Dictionary

1. main(adjective)ɪn, maɪn

   most important or most used

   the main highway into the city; his main source of income; the main reason for doing sth

2. mainɪn, maɪn

   indicates what is important

   The main thing is that we can prevent it from happening again.

3. main(noun)ɪn, maɪn

   a large pipe for water or gas

   a burst water main

Wiktionary

1. Main(ProperNoun)

   A river in southern Germany, flowing from Bavaria to the Rhine.

Origin: From mægen, later also taking senses from the adjective.

Webster Dictionary

1. Main(noun)

   a hand or match at dice

2. Main(noun)

   a stake played for at dice

3. Main(noun)

   the largest throw in a match at dice; a throw at dice within given limits, as in the game of hazard

4. Main(noun)

   a match at cockfighting

5. Main(noun)

   a main-hamper

6. Main(u)

   strength; force; might; violent effort

7. Main(u)

   the chief or principal part; the main or most important thing

8. Main(u)

   the great sea, as distinguished from an arm, bay, etc. ; the high sea; the ocean

9. Main(u)

   the continent, as distinguished from an island; the mainland

10. Main(u)

    principal duct or pipe, as distinguished from lesser ones; esp. (Engin.), a principal pipe leading to or from a reservoir; as, a fire main

11. Main(adj)

    very or extremely strong

12. Main(adj)

    vast; huge

13. Main(adj)

    unqualified; absolute; entire; sheer

14. Main(adj)

    principal; chief; first in size, rank, importance, etc

15. Main(adj)

    important; necessary

16. Main(adj)

    very; extremely; as, main heavy

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