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Noun
  1. Any very large body of (salt) water (synset 109368829)
    is a type of: body of water, water - the part of the earth's surface covered with water (such as a river or lake or ocean)
    has:
    • high sea, international waters - the open seas of the world outside the territorial waters of any nation
    • offing - the part of the sea that can be seen from the shore and is beyond the anchoring area
    • territorial waters - the waters surrounding a nation and its territories over which that nation exercises sovereign jurisdiction
    is a part of: hydrosphere - the watery layer of the earth's surface; includes water vapor
    same as: briny
  2. A principal pipe in a system that distributes water or gas or electricity or that collects sewage (synset 103716684)
    is a type of: pipage, pipe, piping - a long tube made of metal or plastic that is used to carry water or oil or gas etc.
    subtypes:
    is a part of: base, infrastructure - the stock of basic facilities and capital equipment needed for the functioning of a country or area
Adjective
  1. Most important element (synset 301280536)
    "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"
    similar to: important, of import - of great significance or value
    same as: chief, master, primary, principal
  2. (of a clause) capable of standing syntactically alone as a complete sentence (synset 300733659)
    "the main (or independent) clause in a complex sentence has at least a subject and a verb"
    referred to in: grammar - the branch of linguistics that deals with syntax and morphology (and sometimes also deals with semantics)
    same as: independent
  3. Of force;
    Of the greatest possible intensity (synset 301516279)
    "by main strength"
    similar to: intense - possessing or displaying a distinctive feature to a heightened degree

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