Dictionary definition · main
noun
- any very large body of (salt) water
- a principal pipe in a system that distributes water or gas or electricity or that collects sewage
adjective
- most important element"the chief aim of living"
- (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"
Source: Open English WordNet (CC BY 4.0).