1

semi

play
noun \ˈse-mē also -ˌmī\

Definition of semi

plural

semis

chiefly British

  1. :  a semidetached house

Origin and Etymology of semi

short for semidetached


First Known Use: 1912


2

semi

play
noun \ˈse-ˌmī also -mē\

Definition of semi

plural

semis

1942

First Known Use of semi

1942

Other Automotive Terms


3

semi

play
noun \same as 2\

Definition of semi

plural

semis

  1. :  semifinal —often used in plural

1942

First Known Use of semi

1942


semi-

prefix \ˌse-mē, -ˌmī, -mi\

Definition of semi-

  1. 1a :  precisely half of: (1) :  forming a bisection of semidiameter (2) :  being a usually vertically bisected form of (a specified architectural feature) semidomeb :  half in quantity or value :  half of or occurring halfway through a specified period of time semiannual semimonthly — compare bi-

  2. 2 :  to some extent :  partly :  incompletely semicivilized semi-independent semidry — compare demi-, hemi-

  3. 3a :  partial :  incomplete semiconsciousness semidarknessb :  having some of the characteristics of semiporcelainc :  quasi- semigovernmental semimonastic

Origin and Etymology of semi-

Middle English, from Latin; akin to Old High German sāmi- half, Greek hēmi-


SEMI Defined for English Language Learners


semi-

prefix \ˌse-mē, -ˌmī, -mi\

Definition of semi- for English Language Learners

  • : half

  • : happening twice during a particular period of time

  • : partly : not completely


SEMI- Defined for Kids

semi-

prefix

Definition of semi- for Students

  1. 1 :  half semicircle

  2. 2 :  partly :  not completely

  3. 3 :  partial



Seen and Heard

What made you want to look up semi? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a dividing ridge between drainage areas

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • shamrock
  • What is the best definition of green-eyed monster?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ