ˌse-mē,
-ˌmī,
-mi
1
a
: precisely half of:
(1)
: forming a bisection of
semicircle
(2)
: being a usually vertically bisected form of (a specified architectural feature)
semidome
b
: half in quantity or value : half of or occurring halfway through a specified period of time
semiannual
semimonthly
compare bi-
3
a
: partial : incomplete
semiconsciousness
semidarkness
b
: having some of the characteristics of
semiporcelain
c
: quasi-
semigovernmental
semimonastic
Examples of semi in a Sentence
Recent Examples on the Web
Georgina Jedikovska, Interesting Engineering, 7 Dec. 2025
Wedding, his fellow Canadian Andrew Clark and others conspired to move hundreds of kilograms of cocaine from the US into Canada using long-haul semi-trucks, according to the indictment.
—Eric Levenson, CNN Money, 6 Dec. 2025
The driver of the semi was not at the scene when emergency crews arrived.
—CBS News, 6 Dec. 2025
People were obsessed with it — total beginners and semi-pros playing side by side, all having fun.
—Ryan MacAsero, Mercury News, 5 Dec. 2025
See All Example Sentences for semi
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Noun
Meanwhile, electrifying semi-trailers has been limited by battery size, weight and charging downtime.
—Georgina Jedikovska, Interesting Engineering, 7 Dec. 2025
Wedding, his fellow Canadian Andrew Clark and others conspired to move hundreds of kilograms of cocaine from the US into Canada using long-haul semi-trucks, according to the indictment.
—Eric Levenson, CNN Money, 6 Dec. 2025
The driver of the semi was not at the scene when emergency crews arrived.
—CBS News, 6 Dec. 2025
People were obsessed with it — total beginners and semi-pros playing side by side, all having fun.
—Ryan MacAsero, Mercury News, 5 Dec. 2025
See All Example Sentences for semi
Cite this Entry
“Semi.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/semi. Accessed 9 Dec. 2025.
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