main - definition, thesaurus and related words from WordNet-Online

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Adjective main has 3 senses

chief, main, primary, principal - 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"
Antonym: unimportant (indirect, via important)
independent, main - of a clause; able to stand alone syntactically as a complete sentence; "the main (or independent) clause in a complex sentence has at least a subject and a verb"
main - of force; of the greatest possible intensity; "by main strength"
Antonym: mild (indirect, via intense)

Noun main has 2 senses

main, briny - any very large body of (salt) water
--₁ is a kind of body of water, water
--₁ is a part of hydrosphere
--₁ has parts: high sea, international waters; offing; territorial waters
main - a principal pipe in a system that distributes water or gas or electricity or that collects sewage
--₂ is a kind of pipe, pipage, piping
--₂ is a part of infrastructure, base
--₂ has particulars:
electric main; gas main; sewer main, sewer line; water main