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plural quantaˈkwän-tə 
1
:large,significant
aquantum improvement
2
:of, relating to, or employing the principles of quantum mechanics
quantum physics
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Examples ofquantum in a Sentence
Noun the sum of human knowledge is now so immense that even a highly educated person can hope to absorb only a tinyquantum of it
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Georgina Jedikovska,Interesting Engineering, 16 Oct. 2025Jim Cramer previously flagged the group —quantum, nuclear, crypto, and rare earth stocks — as a risk to the market rally.—Natasha Abellard,CNBC, 14 Oct. 2025Prabhat Ranjan Mishra,Interesting Engineering, 17 Oct. 2025This allows electrons and nuclei to bind together in order to form neutral atoms, where every unique species of atom, depending on the number of protons in its nucleus, has its own unique electron structure, in accordance with the fundamental laws ofquantum physics that govern our Universe.—Big Think, 16 Oct. 2025See All Example Sentences forquantum
Examples are automatically compiled from online sources to show current usage.Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.Send us feedback.
Noun
These, among others, include ultra-efficientquantum motors capable of performing precise tasks at the nanoscale.—Georgina Jedikovska,Interesting Engineering, 16 Oct. 2025Jim Cramer previously flagged the group —quantum, nuclear, crypto, and rare earth stocks — as a risk to the market rally.—Natasha Abellard,CNBC, 14 Oct. 2025Adjective
However, the delivery of information between distantquantum computers requires the conversion of that information into light, where traditional fiber-optics at room temperature could be used to enable true quantum networks, according to researchers.—Prabhat Ranjan Mishra,Interesting Engineering, 17 Oct. 2025This allows electrons and nuclei to bind together in order to form neutral atoms, where every unique species of atom, depending on the number of protons in its nucleus, has its own unique electron structure, in accordance with the fundamental laws ofquantum physics that govern our Universe.—Big Think, 16 Oct. 2025See All Example Sentences forquantumWord History
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“Quantum.”Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/quantum. Accessed 24 Oct. 2025.
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Medical Definition
quantum
nounquan·tumˈkwänt-əm
plural quantaˈkwänt-ə
1
:one of the very small increments or parcels into which many forms of energy are subdivided
a molecule of rhodopsin in the human eye can cause a response to a singlequantum of light
2
:one of the small molecular packets of a neurotransmitter (as acetylcholine) released into the synaptic cleft in the transmission of a nerve impulse across a synapse
More from Merriam-Webster onquantum
Nglish:Translation ofquantum for Spanish Speakers
Britannica.com:Encyclopedia article aboutquantum
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