semi

1 of 4

noun (1)

plural semis
Synonyms of seminext
: semifinal
often used in plural

semi

2 of 4

noun (2)

plural semis

semi

3 of 4

noun (3)

plural semis
chiefly British
: a semidetached house

semi-

4 of 4

prefix

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-
2
: to some extent : partly : incompletely
semi-independent
semidry
compare demi-, hemi-
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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Noun
The whimsical semi-staging of Ravel’s opera, The Child and the Magical Spells, was delightful. Beth Wood, San Diego Union-Tribune, 21 Dec. 2025 Charles Jeffrey Loverboy by Scottish fashion designer Charles Jeffrey; Post Archive Faction (PAF), a Korean menswear brand based in South Korea that was a semi-finalist of the LVMH Prize in 2021; and Maison Kitsuné each return to the presentation schedule. Laure Guilbault, Vogue, 18 Dec. 2025 While there are plenty of other moka pots of different styles out there, Bialetti's center-split inverted octagonal semi-pyramids have become synonymous with this particular piece of kitchen ware. New Atlas, 18 Dec. 2025 Both reached the semi-finals of the previous AFCON, and South Africa topped their qualifying group for next year’s World Cup. Jay Harris, New York Times, 17 Dec. 2025 See All Example Sentences for semi

Word History

Etymology

Noun (3)

short for semidetached

Prefix

Middle English, from Latin; akin to Old High German sāmi- half, Greek hēmi-

First Known Use

Noun (1)

1942, in the meaning defined above

Noun (2)

1942, in the meaning defined above

Noun (3)

1912, in the meaning defined above

Time Traveler
The first known use of semi was in 1912

Browse Nearby Words

Cite this Entry

“Semi.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/semi. Accessed 26 Dec. 2025.

Kids Definition

semi-

prefix
ˌsem-i
ˈsem-
-ˌī
1
: half in amount or value
semitone
2
: occurring halfway through a certain time period
semiannual
3
: to some extent : partly : incompletely
semitropical
4
: partial : incomplete
semidarkness
Etymology

Prefix

Latin semi- "half"

More from Merriam-Webster on semi

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