To save this word, you'll need to log in.
\ ˈse-mē 
also -ˌmī \
also -ˌmī \ plural semis
Definition of semi
(Entry 1 of 4)
chiefly British
: a semidetached house
semi
noun (2)\ ˈse-ˌmī also -mē \
also -mē \ plural semis
Definition of semi (Entry 2 of 4)
semi
noun (3)\ ˈse-ˌmī also -mē \
also -mē \ plural semis
Definition of semi (Entry 3 of 4)
: semifinal —often used in plural
semi-
prefix\ ˌse-mē, -ˌmī, -mi \
Definition of semi- (Entry 4 of 4)
1a : 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-
3a : partial : incomplete
semiconsciousness semidarkness
b : having some of the characteristics of
semiporcelain
c : quasi- semigovernmental semimonastic
Keep scrolling for more
Keep scrolling for more
Keep scrolling for more
Comments on semi
What made you want to look up semi? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
May 2020 Words of the Day Quiz
- Which is a synonym of exiguous?
Can you spell these 10 commonly misspelled words?
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridgedWords at Play
Ask the Editors
Word Games
Share semi
Time Traveler for semi
The first known use of semi was in 1912
See more words from the same year