often attributive
1
: a device that utilizes the natural oscillations of atoms or molecules between energy levels for generating a beam of coherent electromagnetic radiation usually in the ultraviolet, visible, or infrared regions of the spectrum
also
: the beam of coherent radiation itself
The cesium fluoresced. This told them they had the necessary population of excited atoms to produce a laser. —
Nick Taylor
Nick Taylor 2
: something resembling a laser beam in accuracy, speed, or intensity
threw a laser into the end zone
a laser stare
lasered; lasering; lasers
: to subject to the action of a laser : treat with a laser
Examples of laser in a Sentence
Noun
doctors using a laser to perform delicate eye surgery
Recent Examples on the Web
Munis Raza, Interesting Engineering, 25 Mar. 2026
Traders and investors are laser-focused on the inflation being kindled by higher oil prices.
—Christopher Cann, USA Today, 25 Mar. 2026
Zachary Schermele, USA Today, 12 Mar. 2026
Park lasers a ball to Salas for the final out of the phase.
—Caleb Yum, Austin American Statesman, 10 Mar. 2026
See All Example Sentences for laser
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Noun
The system uses a multi-vote command architecture that requires several internal checks before firing, including a safeguard that prevents the laser from discharging if a civilian aircraft overlaps with the beam path.
—Munis Raza, Interesting Engineering, 25 Mar. 2026
Traders and investors are laser-focused on the inflation being kindled by higher oil prices.
—Christopher Cann, USA Today, 25 Mar. 2026
Verb
The Senate overwhelmingly passed a bipartisan housing reform bill on March 12 as both parties attempt to laser focus on affordability issues ahead of the midterm elections.
—Zachary Schermele, USA Today, 12 Mar. 2026
Park lasers a ball to Salas for the final out of the phase.
—Caleb Yum, Austin American Statesman, 10 Mar. 2026
See All Example Sentences for laser
Cite this Entry
“Laser.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/laser. Accessed 31 Mar. 2026.
Copy CitationKids Definition
laser
1 of 2 noun
la·ser
ˈlā-zər 
: a device that uses the natural vibrations of atoms or molecules to generate a narrow beam of light having a small frequency range
laser
2 of 2 verb
: to subject to the action of a laser
Etymology
Noun
light amplification by stimulated emission of radiation
Medical Definition
laser
1 of 2 noun
la·ser
ˈlā-zər
: a device that utilizes the natural oscillations of atoms or molecules between energy levels for generating coherent electromagnetic radiation usually in the ultraviolet, visible, or infrared regions of the spectrum
laser
2 of 2 transitive verb
: to subject to the action of a laser : treat with a laser
cutting a corneal flap to remove tissue and then lasering the area under it—Jenny Manzer
Jenny ManzerLove words? Need even more definitions?
Merriam-Webster unabridged
