amass

verb

ə-ˈmas 

amassed; amassing; amasses

transitive verb

1

: to collect for oneself : accumulate

amass a great fortune

2

: to collect into a mass : gather

must select rather than simply amass details

intransitive verb

: to come together : assemble

Dark clouds amassed over the city.

amasser noun

amassment

ə-ˈmas-mənt 

noun

Synonyms of amass

• collect
• gather
• assemble
• accumulate
• garner

Examples of amass in a Sentence

They've amassed a wealth of information.

amassed a truckload of donations in the course of their canned food drive

Recent Examples on the Web

Both had amassed more than 100 points and scored goals for fun. —Phil Hay, New York Times, 27 Apr. 2026

Ding, a Princeton University graduate, currently has a 30 (and counting) game streak and has amassed over $800,000 in winnings so far as of April 24. —Jessica Sager, PEOPLE, 26 Apr. 2026

These markets, which now amass tens of billions of dollars in bets every month, are a dangerous expansion of gambling. —Editorial, Boston Herald, 25 Apr. 2026

As a full-time professor for decades, David Cheriton amassed a fortune worth more than $15 billion today, much of it by investing in the companies of Stanford students. —Theo Baker, The Atlantic, 24 Apr. 2026

Word History

Etymology

Anglo-French amasser, from a- (from Latin ad-) + masser to gather into a mass, from masse mass

First Known Use

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

Rhymes for amass

• alas
• bromegrass
• bypass
• chagas
• crabgrass
• crevasse
• eelgrass
• eyeglass
• groundmass
• harass
• impasse
• jackass

Kids Definition

amass

verb

ə-ˈmas 

: to collect into a mass : accumulate

amasser noun