Standard Lemma guide

semi

adv · noun · 11 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • Received-Pronunciation: /ˈsɛmi/
  • US: /ˈsɛmi/
  • US: /ˈsɛmaɪ/
  • Australia: Recorded audio is listed in the source snapshot.
  • UK: Recorded audio is listed in the source snapshot.
  • rhymes with -ɛmi
  • CMU ARPABET: S EH1 M IY0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
  • CMU ARPABET 2: S EH1 M AY0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

adv

Meaning 1

Somewhat; to some extent.

Definition source: English Wiktionary via Wiktextract

Usage: informal, not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A semi-detached house.

Definition source: English Wiktionary via Wiktextract

Usage: Australia, Canada, Ireland, UK, informal

Examples

  • 2008, Elliott Placks, quoted in Helen Isbister, Morris Bryant, Property, Career FAQs, Australia, page 40, I′m selling two side-by-side semis that are currently under construction, a waterfront apartment and a house in Rose Bay.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A semi-trailer; a tractor-trailer; an eighteen-wheeler; an artic.

Definition source: English Wiktionary via Wiktextract

Usage: Australia, Canada, New-Zealand, US

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

A semifinal.

Definition source: English Wiktionary via Wiktextract

Usage: informal

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

A partial erection of the penis.

Definition source: English Wiktionary via Wiktextract

Usage: slang

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

A semiautomatic firearm.

Definition source: English Wiktionary via Wiktextract

Usage: slang

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

Semiconductor companies or positions in the stock market.

Definition source: English Wiktionary via Wiktextract

Usage: slang

Topics: business, finance

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

8

noun

Meaning 8

An intermediate in the production of end-use goods.

Definition source: English Wiktionary via Wiktextract

Usage: colloquial

Topics: business, mining

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

9

noun

Meaning 9

a trailer having wheels only in the rear; the front is supported by the towing vehicle

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: semitrailer

Antonyms: none provided

Broader terms: trailer

10

noun

Meaning 10

a truck consisting of a tractor and trailer together

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: trailer truck, tractor trailer, trucking rig, rig, articulated lorry

Antonyms: none provided

Broader terms: truck, motortruck

Narrower terms: tandem trailer

11

noun

Meaning 11

one of the two competitions in the next to the last round of an elimination tournament

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: semifinal

Antonyms: none provided

Broader terms: match

History

Etymology

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

Across languages

Translations

5 source translations are retained for this English entry.

  • Finnish: puolierektio — semi-erection
  • Finnish: semi — semi-erection
  • French: demi-molle — semi-erection
  • Polish: częściowa erekcja — semi-erection
  • Portuguese: meia-bomba — semi-erection