rest mass

Save This Word!

noun Physics.

the mass of a body as measured when the body is at rest relative to an observer, an inherent property of the body.

QUIZ

CAN YOU ANSWER THESE COMMON GRAMMAR DEBATES?

There are grammar debates that never die; and the ones highlighted in the questions in this quiz are sure to rile everyone up once again. Do you know how to answer the questions that cause some of the greatest grammar debates?

Question 1 of 7

Which sentence is correct?

His boss, whom he admires, is waiting to meet with him about the big project.

His boss, who he admires, is waiting to meet with him about the big project.

TAKE THE QUIZ TO FIND OUT

Compare relativistic mass.

Origin of rest mass

First recorded in 1910–15

Words nearby rest mass

restitution, restive, restless, restless cavy, restlessness, rest mass, resto, restock, Reston, rest on one's laurels, restoral

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use rest mass in a sentence

These two videos rest atop bookmarked links to The Jeffrey Epstein Foundation.
Sleazy Billionaire’s Double Life Featured Beach Parties With Stephen Hawking|M.L. Nestel|January 8, 2015|DAILY BEAST
Their bodies were later found incinerated and buried in mass graves outside of town.
Why Mexicans Are Enraged by Obama’s Big Tuesday Meeting|Ruben Navarrette Jr.|January 6, 2015|DAILY BEAST
Beyond the huge American flag that hung over the street, the mile-long mass of cops ended.
Funeral Protest Is Too Much for NYPD Union Boss|Michael Daly|January 5, 2015|DAILY BEAST
I will turn my nose up when you offer me the rest of some delicious pastry that you nibbled on.
Why My Norovirus Panic Makes Me Sick|Lizzie Crocker|January 5, 2015|DAILY BEAST

Hopefully, she got as much of a laugh out of it as the rest of the world has.
Slow Motion Tiger Jump, a Tornado at the Rose Bowl and More Viral Videos|The Daily Beast Video|January 4, 2015|DAILY BEAST
Charred beams and blackened walls showed stark and gaunt in the glow of a smoldering mass of wreckage.
The Red Year|Louis Tracy
Edna Pontellier, casting her eyes about, had finally kept them at rest upon the sea.
The Awakening and Selected Short Stories|Kate Chopin
He worketh under correction, and seeketh to rest: let his hands be idle, and he seeketh liberty.
The Bible, Douay-Rheims Version|Various
We had half a dozen passengers to Ferrara; for the rest of the way, I had this extensive traveling establishment to myself.
Glances at Europe|Horace Greeley
But hitherto, before these new ideas began to spread in our community, the mass of men and women definitely settled down.
The Salvaging Of Civilisation|H. G. (Herbert George) Wells

British Dictionary definitions for rest mass

rest mass

noun

the mass of an object that is at rest relative to an observer. It is the mass used in Newtonian mechanics

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for rest mass

rest mass

In Special and General Relativity, the observed mass of a body that is not in motion with respect to the observer. Also called invariant mass Compare relativistic mass.