Main definitions

mān
Main is described as the most important or primary person or thing.

An example of main is a main character, such as Tom Sawyer being the primary character in the book The Adventures of Tom Sawyer.

adjective
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The definition of a main is a primary line used for distributing water, gas and electricity.

An example of a main is an underground pipe that brings water to a building.

noun
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Most important; principal.
adjective
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Exerted to the utmost; sheer.
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Connected to or located near the mainmast.

A main skysail.

adjective
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Of or relating to a continuous area or stretch, as of land or water.
adjective
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The chief or largest part.

His ideas are, in the main, impractical.

noun
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The principal pipe or conduit in a system for conveying water, gas, oil, or other utility.
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A mainland.
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The open ocean.
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A mainsail.
noun
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A mainmast.
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A river rising in eastern Germany and flowing about 525 km (325 mi) generally westward to the Rhine River at Mainz.
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Physical strength; force; power.
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The principal or most important part or point.
noun
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A principal pipe, conduit, or line in a distribution system for water, gas, electricity, etc.
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The high, or open, sea; ocean.
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The mainland.
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Any broad expanse.
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Strong; powerful.
adjective
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Chief in size, extent, importance, etc.; principal; leading; specif., designating a large central unit on which subsidiaries or branches depend.

The main post office.

adjective
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Of, near, or connected with the mainmast or mainsail.
adjective
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Remarkable; considerable.
adjective
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Designating a broad expanse of land, sea, or space.
adjective
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River in SW Germany, flowing west into the Rhine at Mainz: 307 mi (494 km)
proper name
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Principal; prime; chief; leading; of chief or principal importance. [from 15th c.]
adjective
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Principal or chief in size or extent; largest; consisting of the largest part; most important by reason or size or strength.

Main timbers; main branch of a river; main body of an army.

adjective
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Full; undivided; sheer (of strength, force etc.). [from 16th c.]
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(nautical) Belonging to or connected with the principal mast in a vessel.
adjective
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(dialectal) Big; angry.
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(UK, dialectal) Very; very much; greatly; mightily; extremely; exceedingly.
adverb
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That which is chief or principal; the chief or main portion; the gross; the bulk; the greater part.
noun
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(now archaic, US dialectal) The mainland. [from 16th c.]
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(now poetic) The high seas. [from 16th c.]
noun
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A large pipe or cable providing utility service to a building or area, such as water main or electric main. [from 17th c.]
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(nautical) The mainsail. [from 17th c.]
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A hand or match in a game of dice.

noun
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A stake played for at dice.
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The largest throw in a match at dice; a throw at dice within given limits, as in the game of hazard.
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A match at cockfighting.
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A main-hamper, or fruit basket.

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

Fought with might and main.

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Origin of main

From Middle English main, mayn, meyn, partly from Old English mægen- ("strong, principal, main"; used in combination), from Old English mæġen (“strength"), and partly from Old Norse megn, megenn (“strong, main"); both from Proto-Germanic *maginÄ… (“strength, power, might"), *maginaz (“strong"), from Proto-Indo-European *mogh-, *megh- (“power"). Cognate with Old High German megÄ«n (“strong, mighty"), German Möge, Vermögen (“power, wealth"). Akin also to Old English magan (“to be able to"). More at may.