Semi definition

sĕmī, sĕmē
Frequency:
A semifinal.
noun
19
7
Half.

Semicircle.

affix
13
7
Partly, not fully, imperfectly.

Semicivilized.

affix
9
4
Twice in a (specified period)

Semicentennial.

affix
6
1
noun
4
1
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Half.

Semicircle.

prefix
9
8
Partial; partially.

Semiconscious.

prefix
3
2
Occurring twice during.

Semimonthly.

prefix
4
4
A semitrailer and the tractor to which it is attached.
noun
3
3
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Resembling or having some of the characteristics of.

Semiofficial.

prefix
2
2
A semitrailer.
noun
1
1
A tractor-trailer.
noun
1
1
prefix
1
1
A semiformal dance.
noun
1
2
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(slang) A partial erection.
noun
0
1
anagrams
0
1
prefix
0
1
Somewhat, rather, quasi-
prefix
0
1
A prefix that means “half,” (as in semicircle, half a circle) or “partly, somewhat, less than fully,” (as in semiconscious, partly conscious).
2
4
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(UK, Australia, Canada) A semi-detached house.
noun
0
2

Other Word Forms

Noun

Singular:
semi
Plural:
semis

Origin of semi

  • L < IE *semi- > Gr hēmi-, Sans sāmi-, OE sām-

    From Webster's New World College Dictionary, 5th Edition

  • Middle English from Latin sēmi- half sēmi- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • The prefix semi- (from Latin) used as a noun.

    From Wiktionary

  • From Latin semi- (“half").

    From Wiktionary