I. a.
1.
Chief, principal, leading, cardinal, capital.
2.
Important, essential, necessary, requisite, indispensable, vital.
3.
Mighty, vast, huge, enormous.
4.
Sheer, pure, directly applied.
5.
Absolute, mere, direct, entire.
II. n.
1.
Ocean, great sea, high sea.
2.
Continent, mainland.
3.
Main conduit, main pipe, main duct, main channel.
4.
Principal point.
5.
Force, power, strength, might, violent effort.
6.
The gross, the bulk, the greater part, majority.
7.
Hamper, large basket.