extension
noun
ex·ten·sion
ik-ˈsten(t)-shən 
1
2
3
a
: the stretching of a fractured or dislocated limb so as to restore it to its natural position
b
: an unbending movement around a joint in a limb (such as the knee or elbow) that increases the angle between the bones of the limb at the joint compare flexion sense 4a
4
: a property whereby something occupies space
5
: an increase in length of time
specifically
: an increase in time allowed under agreement or concession
6
: a program that geographically extends the educational resources of an institution by special arrangements (such as correspondence courses) to persons otherwise unable to take advantage of such resources
7
a
: a part constituting an addition
b
: a section or line segment forming an additional length
c
: an extra telephone connected to the principal line
d
: a length of natural or synthetic hair that is worn attached to one's natural hair
e
: a series of usually three or four characters following a dot at the end of the name of a computer file that specifies the file's format or purpose
8
: a mathematical set (such as a field or group) that includes a given and similar set as a subset
Examples of extension in a Sentence
extension of the patient's life
He's asking for a contract extension.
Make sure that the muscles get the proper amount of extension.
I missed the deadline but was granted an extension.
Recent Examples on the Web
In July 2007, he was traded to the Atlanta Braves after rejecting an eight-year, $140 million contract extension.
—
Taylor Millard, The Washington Examiner, 19 Sep. 2025
But McTavish joined New Jersey Devils defenseman Luke Hughes as the only high-profile restricted free agents to have reached the opening of training camp sans contract extension.
—Andrew Knoll, Oc Register, 19 Sep. 2025
For the Tesla Model Y (sport-utility vehicle), this translates into a potential driving range extension of nearly 90 miles (about 145 km) without increasing the battery pack’s size.
—Mrigakshi Dixit, Interesting Engineering, 19 Sep. 2025
Rat Saw God than an extension of its hazy Southern world-building, Bleeds is Wednesday at their best—again.
—Nina Corcoran, Pitchfork, 19 Sep. 2025
See All Example Sentences for extension
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Taylor Millard, The Washington Examiner, 19 Sep. 2025
But McTavish joined New Jersey Devils defenseman Luke Hughes as the only high-profile restricted free agents to have reached the opening of training camp sans contract extension.
—Andrew Knoll, Oc Register, 19 Sep. 2025
For the Tesla Model Y (sport-utility vehicle), this translates into a potential driving range extension of nearly 90 miles (about 145 km) without increasing the battery pack’s size.
—Mrigakshi Dixit, Interesting Engineering, 19 Sep. 2025
Rat Saw God than an extension of its hazy Southern world-building, Bleeds is Wednesday at their best—again.
—Nina Corcoran, Pitchfork, 19 Sep. 2025
See All Example Sentences for extension
Cite this Entry
“Extension.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/extension. Accessed 21 Sep. 2025.
Copy CitationKids Definition
extension
noun
ex·ten·sion
ik-ˈsten-chən
1
: the act of extending : the state of being extended
2
: an increase in time
was given an extension to finish his project
3
: education by special programs at a distance from a school
4
a
: a part forming an addition or increase
b
: an extra telephone connected to the main line
Medical Definition
extension
noun
ex·ten·sion
ik-ˈsten-chən
1
: the stretching of a fractured or dislocated limb so as to restore it to its natural position
2
: an unbending movement around a joint in a limb (as the knee or elbow) that increases the angle between the bones of the limb at the joint compare flexion sense 1
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