What is the meaning of bulk?

noun

• The property resulting from being or relating to the greater in number of two parts; the main part.
  • usage: "the majority of his customers prefer it"; "the bulk of the work is finished"
  • synonyms: majority
• The property of something that is great in magnitude.
  • usage: "it is cheaper to buy it in bulk"; "he received a mass of correspondence"; "the volume of exports"
  • synonyms: mass, volume
• The property possessed by a large mass.

verb

• Stick out or up.
  • usage: "The parcel bulked in the sack"
• Cause to bulge or swell outwards.
  • synonyms: bulge