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
Traditional markers of achievement, by contrast, carried far less weight.
—
Preston Fore, Fortune, 18 Dec. 2025
Following the accident, the northbound lanes of I-25 at mile marker 259, near Crossroads Boulevard, will be closed for an extended period.
—Charna Flam, PEOPLE, 17 Dec. 2025
According to The Texas Newsroom, some of the applicants in the records were unaware of Abbott’s policy restrictions around updating their gender markers.
—Abby Monteil, Them., 16 Dec. 2025
The study also highlights the potential benefit of menstrual tracking when used alongside other health markers.
—Ciara Lucas, SELF, 16 Dec. 2025
See All Example Sentences for marker
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show current usage.
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Preston Fore, Fortune, 18 Dec. 2025
Following the accident, the northbound lanes of I-25 at mile marker 259, near Crossroads Boulevard, will be closed for an extended period.
—Charna Flam, PEOPLE, 17 Dec. 2025
According to The Texas Newsroom, some of the applicants in the records were unaware of Abbott’s policy restrictions around updating their gender markers.
—Abby Monteil, Them., 16 Dec. 2025
The study also highlights the potential benefit of menstrual tracking when used alongside other health markers.
—Ciara Lucas, SELF, 16 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 20 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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