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BNC: 15743 COCA: 20144

semi

semi noun
plural semis
semi
noun
plural semis
Learner's definition of SEMI
[count] informal
/ˈsɛˌmaɪ/ : semifinal usually plural通常用复数
/ˈsɛˌmaɪ/ US : a short, heavy truck that has a long trailer attached to the back and that is used to move goods : semitrailer半拖卡车;半拖车
/ˈsɛmi/ British : a house that is attached to another house : a semidetached house半独立式住宅
BNC: 15743 COCA: 20144

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
semidiameter
(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
semicivilized
semi-independent
semidry
compare demi-, hemi-
3
a
: partial : incomplete
semiconsciousness
semidarkness
b
: having some of the characteristics of
semiporcelain
c
: quasi-
semigovernmental
semimonastic

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
BNC: 15743 COCA: 20144

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