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
Not every blemish is a marker of internal turmoil, but certain ones raise red flags for dermatologists, who then investigate further.
—
Angela Haupt, TIME, 24 Feb. 2025
Vaccaro explains how gaining Jordan’s trust wasn’t easy, especially when the topic of Vaccaro declining to pick Jordan for the Roundball Classic—by that point a marker of true prospect status—surfaced in his first meeting with Jordan.
—Michael McCann, Sportico.com, 24 Feb. 2025
Trust and loyalty amongst staff were other recurring markers of success, too.
—Kayleigh Ruller, Charlotte Observer, 24 Feb. 2025
Image Image In the past few months, the battle over this studio has taken on national significance as a marker of how far the British government will go to use development as a means to revive the nation’s stagnant economy.
—Eshe Nelson, New York Times, 23 Feb. 2025
See All Example Sentences for marker
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Cite this Entry
“Marker.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/marker. Accessed 27 Feb. 2025.
Kids 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
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
called also marker gene
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