Standard Lemma guide

efficiency

noun · 7 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.

  • /ɪˈfɪʃ.ən.si/
  • [ɪˈfɪʃn̩si]
  • /ɪˈfɪʃ.ɪn.si/
  • California, Southern: Recorded audio is listed in the source snapshot.
  • CMU ARPABET: IH0 F IH1 SH AH0 N S IY0 Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

1

noun

Meaning 1

The extent to which a resource is used for the intended purpose.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: inefficiency, wastefulness

2

noun

Meaning 2

The extent to which a resource is used for the intended purpose.

The ratio of useful work to energy expended. Often given the symbol η.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Topics: engineering, natural-sciences, physical-sciences, physics

Examples

  • The efficiency of this loudspeaker is 40%.

Meaning relationships

Synonyms: none provided

Antonyms: inefficiency, wastefulness

3

noun

Meaning 3

The extent to which a resource is used for the intended purpose.

The extent to which time is well used for the intended task.

Definition source: English Wiktionary via Wiktextract

Usage: countable, uncountable

Examples

  • The efficiency of the planning department is deplorable.

Meaning relationships

Synonyms: none provided

Antonyms: inefficiency, wastefulness

4

noun

Meaning 4

The quality of producing an effect or effects.

Definition source: English Wiktionary via Wiktextract

Usage: countable, dated, uncountable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

A one-room apartment.

Definition source: English Wiktionary via Wiktextract

Usage: US, countable, uncountable

Examples

  • I have an efficiency available June through July.
  • fully-furnished efficiencies

Meaning relationships

Synonyms: efficiency apartment, studio apartment, bedsit

Antonyms: none provided

6

noun

Meaning 6

skillfulness in avoiding wasted time and effort

Definition source: Princeton WordNet 3.0

Examples

  • she did the work with great efficiency

Meaning relationships

Synonyms: none provided

Antonyms: inefficiency

Broader terms: skillfulness

Narrower terms: economy

7

noun

Meaning 7

the ratio of the output to the input of any system

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: ratio

Narrower terms: figure of merit

History

Etymology

From Latin efficientia, equivalent to efficient + -cy.

Across languages

Translations

66 source translations are retained for this English entry.

  • Bulgarian: ефективност (efektivnost) — extent to which time is well used
  • Catalan: eficiència — extent to which time is well used
  • Chinese Mandarin: 效率 (xiàolǜ) — extent to which time is well used
  • Chinese Mandarin: 效能 (xiàonéng) — extent to which time is well used
  • Czech: efektivita — extent to which time is well used
  • Dutch: efficiëntie — extent to which time is well used
  • Finnish: tehokkuus — extent to which time is well used
  • French: efficacité — extent to which time is well used
  • German: Effizienz — extent to which time is well used
  • German: Wirkungsgrad — extent to which time is well used
  • Hungarian: hatékonyság — extent to which time is well used
  • Italian: efficienza — extent to which time is well used
  • Italian: rendimento — extent to which time is well used
  • Japanese: 効率性 — extent to which time is well used
  • Japanese: 効率 — extent to which time is well used
  • Japanese: 時間効率 — extent to which time is well used
  • Latin: efficientia — extent to which time is well used
  • Polish: efektywność — extent to which time is well used
  • Portuguese: eficiência — extent to which time is well used
  • Romanian: eficiență — extent to which time is well used
  • Russian: эффекти́вность (effektívnostʹ) — extent to which time is well used
  • Slovak: efektívnosť — extent to which time is well used
  • Spanish: eficiencia — extent to which time is well used
  • Swedish: effektivitet — extent to which time is well used
  • Tagalog: katalban — extent to which time is well used
  • Tagalog: katalaban — extent to which time is well used
  • Thai: ประสิทธิภาพ (bprà-sìt-tí-pâap) — extent to which time is well used
  • Turkish: verimlilik — extent to which time is well used
  • Azerbaijani: səmərə — extent to which a resource is used for the intended purpose
  • Bulgarian: производителност (proizvoditelnost) — extent to which a resource is used for the intended purpose
  • Catalan: rendiment — extent to which a resource is used for the intended purpose
  • Chinese Mandarin: 效率 (xiàolǜ) — extent to which a resource is used for the intended purpose
  • Chinese Mandarin: 效能 (xiàonéng) — extent to which a resource is used for the intended purpose
  • Czech: účinnost — extent to which a resource is used for the intended purpose
  • Dutch: rendement — extent to which a resource is used for the intended purpose
  • Finnish: hyötysuhde — extent to which a resource is used for the intended purpose
  • French: rendement — extent to which a resource is used for the intended purpose
  • German: Effizienz — extent to which a resource is used for the intended purpose
  • German: Leistungsfähigkeit — extent to which a resource is used for the intended purpose
  • German: Wirksamkeit — extent to which a resource is used for the intended purpose
  • Hungarian: hatásfok — extent to which a resource is used for the intended purpose
  • Italian: efficienza — extent to which a resource is used for the intended purpose
  • Japanese: 効率性 — extent to which a resource is used for the intended purpose
  • Japanese: 効率 — extent to which a resource is used for the intended purpose
  • Latin: efficientia — extent to which a resource is used for the intended purpose
  • Malay: kecekapan — extent to which a resource is used for the intended purpose
  • Malay: keefisienan — extent to which a resource is used for the intended purpose
  • Malay: efisiensi — extent to which a resource is used for the intended purpose
  • Polish: sprawność — extent to which a resource is used for the intended purpose
  • Portuguese: eficiência — extent to which a resource is used for the intended purpose
  • Russian: эффекти́вность (effektívnostʹ) — extent to which a resource is used for the intended purpose
  • Swedish: verkningsgrad — extent to which a resource is used for the intended purpose
  • Tagalog: katalban — extent to which a resource is used for the intended purpose
  • Tagalog: katalaban — extent to which a resource is used for the intended purpose
  • Thai: ประสิทธิภาพ (bprà-sìt-tí-pâap) — extent to which a resource is used for the intended purpose
  • Turkish: verimlilik — extent to which a resource is used for the intended purpose
  • Uzbek: samaradorlik — extent to which a resource is used for the intended purpose
  • Finnish: yksiö — one-room apartment
  • Galician: estudio — one-room apartment
  • German: Einzimmerwohnung — one-room apartment
  • German: Einraumwohnung — one-room apartment
  • Greek: γκαρσονιέρα (gkarsoniéra) — one-room apartment
  • Greek: στούντιο (stoúntio) — one-room apartment
  • Swedish: enrummare — one-room apartment
  • Swedish: etta — one-room apartment
  • Swedish: övernattningsrum — one-room apartment
Real reading context

efficiency in complete knowledge articles