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 truck was located in Port Wentworth, Georgia, but Gonzalez was not with the semi, the FBI said. David Goodhue, Miami Herald, 28 Apr. 2026 The semi-finals soon get underway and The Athletic will have live coverage of both first legs on Tuesday and Wednesday. The Athletic Live Team, New York Times, 27 Apr. 2026 Popular compact varieties include the Dwarf Eureka and the Calamondin semi-dwarf. Rachel Silva, Martha Stewart, 25 Apr. 2026 Only at the end does Cee Cee get a predictable semi-transformation. Frank Rizzo, Variety, 23 Apr. 2026 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.grautoblog.com/dictionary/semi. Accessed 29 Apr. 2026.

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"

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