1
: one that marks
2
: something used for marking: such as
a
: a type of felt tip pen that makes wide lines
drew a tree with green and brown markers
used a permanent marker to label the boxes
b
: any of various sewing devices for making or indicating guidelines
a pin marker for hemlines
3
: score sense 7
specifically
: run
4
5
: something that serves to identify, predict, or characterize: such as
a
b
Examples of marker in a Sentence
A person's accent can be a marker of social class.
the markers on the rock and mineral specimens were old and faded
Recent Examples on the Web
In addition, barley provides beta-glucans, which have shown positive effects on lipid profiles and inflammatory markers in clinical studies.
—
Desireé Oostland, Vogue, 4 Dec. 2025
Advertisement How power works What is hailed as a celebration of democracy was, at times, described as an exercise in biopolitics, in which a citizen's biometrics became the decisive marker for reward and retribution.
—Nabil Salih, Time, 4 Dec. 2025
This dial follows the classic Traditionnelle layout—month at 12 o’clock, date at 3 o’clock, day at 9 o’clock, and a combined moon-phase and age-of-moon display at 6 o’clock—in proportions that leave plenty of white space around the markers.
—Carol Besler, Robb Report, 4 Dec. 2025
Most current humanoid robots require specialized inputs, such as depth sensors or motion-capture markers, but these can be unreliable or difficult to use in unpredictable settings.
—Kaif Shaikh, Interesting Engineering, 4 Dec. 2025
See All Example Sentences for marker
Examples are automatically compiled from online sources to
show current usage.
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Desireé Oostland, Vogue, 4 Dec. 2025
Advertisement How power works What is hailed as a celebration of democracy was, at times, described as an exercise in biopolitics, in which a citizen's biometrics became the decisive marker for reward and retribution.
—Nabil Salih, Time, 4 Dec. 2025
This dial follows the classic Traditionnelle layout—month at 12 o’clock, date at 3 o’clock, day at 9 o’clock, and a combined moon-phase and age-of-moon display at 6 o’clock—in proportions that leave plenty of white space around the markers.
—Carol Besler, Robb Report, 4 Dec. 2025
Most current humanoid robots require specialized inputs, such as depth sensors or motion-capture markers, but these can be unreliable or difficult to use in unpredictable settings.
—Kaif Shaikh, Interesting Engineering, 4 Dec. 2025
See All Example Sentences for marker
Cite this Entry
“Marker.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/marker. Accessed 5 Dec. 2025.
Copy CitationKids Definition
marker
noun
mark·er
ˈmär-kər 
1
: one that marks
2
: something used for marking
Medical Definition
marker
noun
mark·er
ˈmär-kər
: something that serves to identify, predict, or characterize
a surface marker on a cell that acts as an antigen
: as
a
: biomarker
The recent discovery of a serological marker for the hepatitis C virus has greatly improved diagnostic accuracy for this form of hepatitis.—Gary P. Wormser, letter in The Journal of the American Medical Association
Gary P. Wormser, letter in The Journal of the American Medical Association
b
: genetic marker
The idea in genetic linkage analysis is to see if any particular marker, which serves as a signpost for a specific region of a chromosome, is consistently inherited along with the disease …—Leslie Roberts, Science
Leslie Roberts, Sciencecalled also marker gene
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