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

Inside, visitors will find a significant slice of Lucas’ private collection, amassed over five decades and spanning art, costumes, movie props and memorabilia, with more than 1,300 objects currently displayed across 30 galleries. — Jacqui Palumbo, CNN Money, 5 Sep. 2026

Goudstikker amassed a significant collection of Old Masters paintings and sold them under duress, as ARTnews previously reported. — Brian Boucher, ARTnews.com, 4 Sep. 2026

O’Sullivan was a fixture on British TV and amassed a huge following for his portrayal of Robin Tripp in iconic sitcoms Man About the House and its spin-off, Robin’s Nest. — Jesse Whittock, Deadline, 4 Sep. 2026

The body of evidence that Britton and Lindahl have amassed showing that meditation can sometimes cause harm is now bolstered by others’ research. — Olga Khazan, The Atlantic, 4 Sep. 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
• crabgrass
• crevasse
• eelgrass
• eyeglass
• groundmass
• harass
• impasse
• jackass
• landmass

Kids Definition

amass

verb

ə-ˈmas 

: to collect into a mass : accumulate

amasser noun