Main meaning

any very large body of (salt) water

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

most important element

“the chief aim of living”

“the main doors were of solid glass”

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

“the main (or independent) clause in a complex sentence has at least a subject and a verb”

of force; of the greatest possible intensity

“by main strength”