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
The pointy, 48-foot Art Deco fountain topped by a 6-foot aluminum sphere was erected in 1997 on an island at the intersection of Fifth and Pike streets to be a welcome marker for traffic entering Downtown.
—
Jeff Suess, Cincinnati Enquirer, 11 Dec. 2025
Improved Growth Because of its role in cell growth and division, zinc also improves growth markers in children.
—Amy Brownstein, Verywell Health, 11 Dec. 2025
As with so many things in the desert, prickly pear season is a marker of time, arriving near the end of monsoon season (about late June to mid-September) when the area receives most of its annual rainfall.
—Von Diaz, Bon Appetit Magazine, 11 Dec. 2025
Those are not markers of a healthy roster.
—Pete Grathoff, Kansas City Star, 10 Dec. 2025
See All Example Sentences for marker
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Jeff Suess, Cincinnati Enquirer, 11 Dec. 2025
Improved Growth Because of its role in cell growth and division, zinc also improves growth markers in children.
—Amy Brownstein, Verywell Health, 11 Dec. 2025
As with so many things in the desert, prickly pear season is a marker of time, arriving near the end of monsoon season (about late June to mid-September) when the area receives most of its annual rainfall.
—Von Diaz, Bon Appetit Magazine, 11 Dec. 2025
Those are not markers of a healthy roster.
—Pete Grathoff, Kansas City Star, 10 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 18 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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