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semi

1 of 4

noun (1)

plural semis
: 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 script was developed during Dwivedi’s time at AFI and since has been shortlisted for Mubi’s Cannes W Scripted programme, was a semi-finalist at the Emerging Screenwriters Comedy Competition, and won the IFFLA Pitch Competition in 2024. Udita Jhunjhunwala, Variety, 23 Nov. 2025 With the Celtic Warrior removed, it is expected that LA Knight will receive a bye to the semi-finals. Andrew Ravens‎, MSNBC Newsweek, 21 Nov. 2025 The semi came to a stop, blocking all lanes. November 20, CBS News, 20 Nov. 2025 Tonight marks the semi-finals of DWTS. Lynette Rice, Deadline, 18 Nov. 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 29 Nov. 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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