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 thunderstorm was also affecting parts of I-35 in Missouri between mile markers 62 and 80.
—
Caroline Zimmerman, Kansas City Star, 11 June 2026
The green markings, an investigator’s testimony would explain later in the day, were left on the boat upon impact with a reflective sign on the channel marker.
—David Goodhue, Miami Herald, 11 June 2026
Use buttons to filter wildfires; tap markers for details.
—Meg Wingerter, Denver Post, 10 June 2026
Blood pressure, fasting glucose, insulin resistance and inflammation markers did not significantly improve.
—Allison Palmer, Charlotte Observer, 10 June 2026
See All Example Sentences for marker
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Caroline Zimmerman, Kansas City Star, 11 June 2026
The green markings, an investigator’s testimony would explain later in the day, were left on the boat upon impact with a reflective sign on the channel marker.
—David Goodhue, Miami Herald, 11 June 2026
Use buttons to filter wildfires; tap markers for details.
—Meg Wingerter, Denver Post, 10 June 2026
Blood pressure, fasting glucose, insulin resistance and inflammation markers did not significantly improve.
—Allison Palmer, Charlotte Observer, 10 June 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 12 Jun. 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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