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
As one more marker of Trump’s comeback, the events surrounding his inauguration will be more celebrity-studded than the last time, along with a noticeable turnout by a cadre of tech-world billionaires.
—
Michelle L. Price and Will Weissert, Los Angeles Times, 18 Jan. 2025
As one more marker of Trump’s remarkable comeback, the events surrounding his inauguration will be more celebrity-studded than the last time, along with a noticeable turnout by a cadre of tech-world billionaires.
—Michelle L. Price, Chicago Tribune, 18 Jan. 2025
The next four years will give Trump an opportunity to lay down his marker as one of America’s greatest presidents.
—Gary Franks, Hartford Courant, 17 Jan. 2025
Skinner fended off the Avalanche for the last 48-plus minutes after MacKinnon’s highlight-reel marker.
—Daniel Nugent-Bowman, The Athletic, 17 Jan. 2025
See all Example Sentences for marker 
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Michelle L. Price and Will Weissert, Los Angeles Times, 18 Jan. 2025
As one more marker of Trump’s remarkable comeback, the events surrounding his inauguration will be more celebrity-studded than the last time, along with a noticeable turnout by a cadre of tech-world billionaires.
—Michelle L. Price, Chicago Tribune, 18 Jan. 2025
The next four years will give Trump an opportunity to lay down his marker as one of America’s greatest presidents.
—Gary Franks, Hartford Courant, 17 Jan. 2025
Skinner fended off the Avalanche for the last 48-plus minutes after MacKinnon’s highlight-reel marker.
—Daniel Nugent-Bowman, The Athletic, 17 Jan. 2025
See all Example Sentences for marker
Dictionary Entries Near marker
Cite this Entry
“Marker.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/marker. Accessed 23 Jan. 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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