1
: one that removes heads
especially
: a grain-harvesting machine that cuts off the grain heads and elevates them to a wagon
2
a
: a brick or stone laid in a wall with its end toward the face of the wall
b
: a beam fitted at one side of an opening to support free ends of floor joists, studs, or rafters
c
: a horizontal structural or finish piece over an opening : lintel
d
: a conduit (such as an exhaust pipe for a many-cylindered engine) into which a number of smaller conduits open
e
: a mounting plate through which electrical terminals pass from a sealed device (such as a transistor)
3
: a fall or dive headfirst
took a header into the pool
4
: a shot or pass in soccer made by heading the ball
5
b
: information (such as a page number) printed or placed at the top of each page of a document compare footer sense 2
Examples of header in a Sentence
She tripped on the rock and took a header.
He scored with a header past the goalie.
Recent Examples on the Web
The Cats’ matchup at 5 p.m. Florida time will be the first in the NHL’s opening triple header.
—
Kaitlyn Pohly, Miami Herald, 14 July 2025
At 3 tokens per cell, that’s approximately 600,000 tokens, not even counting the extra tokens needed for headers, formatting, or file structure.
—Aleksandra Bal, Forbes.com, 13 July 2025
Out of all his goals, that second-half header which sealed Barcelona’s third European Cup/Champions League title stands out as a defining moment in his 21-year professional career.
—Asli Pelit, New York Times, 12 July 2025
The library dynamically modifies rules that will remove security headers from web server responses and then claims to add them back after the web page has loaded.
—ArsTechnica, 9 July 2025
See All Example Sentences for header
Examples are automatically compiled from online sources to
show current usage.
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Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
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Kaitlyn Pohly, Miami Herald, 14 July 2025
At 3 tokens per cell, that’s approximately 600,000 tokens, not even counting the extra tokens needed for headers, formatting, or file structure.
—Aleksandra Bal, Forbes.com, 13 July 2025
Out of all his goals, that second-half header which sealed Barcelona’s third European Cup/Champions League title stands out as a defining moment in his 21-year professional career.
—Asli Pelit, New York Times, 12 July 2025
The library dynamically modifies rules that will remove security headers from web server responses and then claims to add them back after the web page has loaded.
—ArsTechnica, 9 July 2025
See All Example Sentences for header
Cite this Entry
“Header.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/header. Accessed 29 Jul. 2025.
Copy CitationKids Definition
header
noun
head·er
ˈhed-ər 
: a fall or dive headfirst
took a header downstairs
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