quantum

[ kwon-tuh m ]
/ ˈkwɒn təm /

noun, plural quan·ta [kwon-tuh] /ˈkwɒn tə/.

quantity or amount: the least quantum of evidence.
a particular amount.
a share or portion.
a large quantity; bulk.
Physics.
  1. the smallest quantity of radiant energy, equal to Planck's constant times the frequency of the associated radiation.
  2. the fundamental unit of a quantized physical magnitude, as angular momentum.

adjective

sudden and significant: a quantum increase in productivity.

QUIZZES

QUIZ TIME: TEST YOUR MEMORY OF THE MAY 2020 WORDS OF THE DAY

Let the aeolian gusts transport you back to these popular Words of the Day from the month of May. How many do you remember?
Question 1 of 10
Which of the following words means “to travel or journey, especially to walk on foot”?

Origin of quantum

1610–20; noun use of neuter of Latin quantus how much

Definition for quantum (2 of 2)

quantum sufficit
[ kwahn-too m soof-i-kit; English kwon-tuh m suhf-uh-sit ]
/ ˈkwɑn tʊm ˈsuf ɪ kɪt; English ˈkwɒn təm ˈsʌf ə sɪt /

adverb Latin.

as much as suffices; enough.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for quantum

British Dictionary definitions for quantum

quantum
/ (ˈkwɒntəm) /

noun plural -ta (-tə)

physics
  1. the smallest quantity of some physical property, such as energy, that a system can possess according to the quantum theory
  2. a particle with such a unit of energy
amount or quantity, esp a specific amount
(often used with a negative) the least possible amount that can sufficethere is not a quantum of evidence for your accusation
something that can be quantified or measured
(modifier) loosely, sudden, spectacular, or vitally importanta quantum improvement

Word Origin for quantum

C17: from Latin quantus (adj) how much
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

Medical definitions for quantum

quantum
[ kwŏntəm ]

n. pl. quan•ta (-tə)

The smallest amount of a physical quantity that can exist independently, especially a discrete quantity of electromagnetic radiation.
This amount of energy regarded as a unit.
A quantity or an amount.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Scientific definitions for quantum

quantum
[ kwŏntəm ]

Plural quanta

A discrete, indivisible manifestation of a physical property, such as a force or angular momentum. Some quanta take the form of elementary particles; for example, the quantum of electromagnetic radiation is the photon, while the quanta of the weak force are the W and Z particles. See also quantum state.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.