bulk

n.

1. Size

   magnitude, mass, extent, size, volume, amount, quantity, weight, heft, largeness, thickness, substance, body; see also quantity, size 2.

2. Major portion

   greater part, better part, main part, principal part, major part, best part, predominant part, most, majority, plurality, biggest share, greater number, nearly all, almost all, body, more than half, best, gross, staple, preponderance, lion's share.

   Antonyms bit*, remnant*, fraction*, minority.

bulk, mass, and volume all refer to a quantity of matter or collection of units forming a body or whole, bulk implying a body of great size, weight, or numbers the lumbering bulk of a hippopotamus, the bulk of humanity, mass, an aggregate, multitude, or expanse forming a cohesive, unified, or solid body an egg-shaped mass, a mass of color, the mass of workers, and volume, a moving or flowing mass, often of a fluctuating nature volumes of smoke, the volume of production