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
After a couple of disappointing individual time trials in recent Grand Tours, this was a marker of his condition, one that needed to go up a further step from his Giro win.
—
Jacob Whitehead,
New York Times,
4 July 2026
This includes Interstate 35 in Missouri between mile markers 27 and 61.
—
Kansas City Star Weather Bot,
Kansas City Star,
4 July 2026
The digital marker is embedded in media created using Google’s AI products as a way to help differentiate between real and fake images.
—
Leah Asmelash,
CNN Money,
3 July 2026
Maybe listening to this song will encourage your toddler to pick up crayons or markers and create some adventures of their own.
—
Parents,
3 July 2026
See All Example Sentences for marker
Examples are automatically compiled from online sources to
show current usage.
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Jacob Whitehead,
New York Times,
4 July 2026
This includes Interstate 35 in Missouri between mile markers 27 and 61.
—
Kansas City Star Weather Bot,
Kansas City Star,
4 July 2026
The digital marker is embedded in media created using Google’s AI products as a way to help differentiate between real and fake images.
—
Leah Asmelash,
CNN Money,
3 July 2026
Maybe listening to this song will encourage your toddler to pick up crayons or markers and create some adventures of their own.
—
Parents,
3 July 2026
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 Jul. 2026.
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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