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\ 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
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Time Traveler for semi
The first known use of semi was in 1912
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