main

When you describe something as main, you mean it's the most important, well-known, or biggest of its kind. The main branch of the post office in a city is usually the largest and busiest.

The main theme of your English paper is your thesis, the basic, fundamental thing you're trying to express in your writing. The main road in town is the most busy and populated — in fact, in many places this road is called "Main Street." This adjective describes things that stand out as the most important or prominent in their category. In the thirteenth century, it meant "large or strong," and came from the Old English mægen, "power, strength, or force."

Primary Meanings of main

1.
adj
most important element
2.
n
a principal pipe in a system that distributes water or gas or electricity or that collects sewage
3.
n
any very large body of (salt) water
Full Definitions of main
1

adj most important element

“the main doors were of solid glass”
Synonyms:
chief, master, primary, principal
important, of import
of great significance or value

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

Synonyms:
independent
Antonyms:
dependent, subordinate
(of a clause) unable to stand alone syntactically as a complete sentence

adj of force; of the greatest possible intensity

“by main strength”
Synonyms:
intense
possessing or displaying a distinctive feature to a heightened degree
2

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

Types:
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electric main
a main that distributes electricity
gas main
a main that distributes gas
sewer line, sewer main
a main in a sewage system
water main
main (a pipe or conduit) for conveying water
Type of:
pipage, pipe, piping
a long tube made of metal or plastic that is used to carry water or oil or gas etc.
3

n any very large body of (salt) water

Synonyms:
briny
Type of:
body of water, water
the part of the earth's surface covered with water (such as a river or lake or ocean)

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