1. Any very large body of (salt) water (synset 109368829)
  2. A principal pipe in a system that distributes water or gas or electricity or that collects sewage (synset 103716684)
  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"
  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"
  3. Of force;
    Of the greatest possible intensity (synset 301516279)
    "by main strength"

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