bulk

1 of 3

noun

ˈbəlk 

also ˈbu̇lk

1

a

: magnitude

impressed by the sheer bulk of her accomplishment

b

biology : material that forms a mass in the intestine

especially : fiber sense 1d

need more bulk in their diet

2

a

: body

especially : a large or corpulent human body

He hauled his … bulk out of the armchair …

—Herman Wouk

b

: an organized structure especially when viewed primarily as a mass of material

… the giant bulk of Mt. Katahdin …

—Jackson Rivers

c

: a ponderous shapeless mass

3

: the main or greater part

spent the bulk of their time in the office

the bulk of the population

see also:

in bulk

bulk

2 of 3

verb

bulked; bulking; bulks

transitive verb

1

: to cause to swell or bulge : stuff

bulk out a report with lots of graphs and charts

2

: to gather into a mass or aggregate

intransitive verb

1

: swell, expand

2

: to appear as a factor : loom

a consideration that bulks large in everyone's thinking

bulk

3 of 3

adjective

1

: being in large quantities or not divided into separate units : being in bulk

bulk shipments of food

bulk mailings

2

: of or relating to materials in bulk

bulk prices

Synonyms of bulk

Noun

• majority

Verb

• collect
• assemble
• gather
• round up
• accumulate
• get together
• corral
• group
• garner

Choose the Right Synonym for bulk

bulk, mass, volume mean the aggregate that forms a body or unit.

bulk implies an aggregate that is impressively large, heavy, or numerous.

the darkened bulk of the skyscrapers

mass suggests an aggregate made by piling together things of the same kind.

a mass of boulders

volume applies to an aggregate without shape or outline and capable of flowing or fluctuating.

a tremendous volume of water

Examples of bulk in a Sentence

Noun

We spent the bulk of the summer at the beach.

Farming makes up the bulk of the country's economy.

The great bulk of these people are extremely poor.

Despite his bulk, he's a very fast runner.

Verb

she bulked up her hair with one hand as she reached for the shears with the other

Adjective

They sent bulk shipments of food to the country.

Recent Examples on the Web

Noun

The organization acquires medical debt in bulk from hospitals, physician groups, collection agencies and other groups for a fraction of the cost. — Queenie Wong, Los Angeles Times, 25 June 2026

The Furart Slim Wallet has built-in RFID-blocking technology, holds six cards, plus cash and an ID, and is thin enough to fit in pants pockets without any bulk. — Chantelle Kincy, Travel + Leisure, 25 June 2026

Verb

For example, adding things like brick powder to spices, or white powders to milk, to bulk them up. — Lorena Galliot, Scientific American, 28 May 2026

His steals total was a bit misleading, and Kansas coach Bill Self will need to bulk him up and teach him more consistent defensive habits. — Brendan Marks, New York Times, 24 Apr. 2026

Adjective

Cost savings are to come from bulk purchases of long-lead reactor components. — Noël Fletcher, Forbes.com, 29 June 2026

Bello’s regression this season has been shocking to behold, and his Jekyll and Hyde act when starting games versus coming out as a bulk reliever defies explanation. — Mac Cerullo, Hartford Courant, 28 June 2026

Word History

Etymology

Noun, Verb, and Adjective

Middle English, heap, bulk, from Old Norse bulki cargo

First Known Use

Noun

15th century, in the meaning defined at sense 1a

Verb

circa 1529, in the meaning defined at transitive sense 1

Adjective

1693, in the meaning defined at sense 1

Phrases Containing bulk

• bulk large
• bulk out
• bulk up
• in bulk
• the bulk

Rhymes for bulk

• fulk
• hulk
• skulk
• sulk

Kids Definition

bulk

1 of 3 noun

ˈbəlk 

1

: greatness of size or mass : volume

2

: a large body or mass

3

: the main or greater part

did the bulk of the work

4

: fiber sense 1f

bulk

2 of 3 verb

1

: to cause to swell or bulge

2

: to appear as a consideration

an issue that bulks large in her mind

bulk

3 of 3 adjective

: being in bulk

bulk foods

Medical Definition

bulk

noun

ˈbəlk 

: material (as indigestible fibrous residues of food) that forms a mass in the intestine

especially : fiber sense 2

Legal Definition

bulk

1 of 2 noun

ˈbəlk 

: a large mass

bulk

2 of 2 adjective

1

: being in bulk

bulk shipment of wheat

bulk foods

2

: of or relating to materials in bulk

bulk buyer