efficient

/ɪˈfɪʃənt/

//ɪˈfɪʃənt// adj

By · According to Wiktionary data (CC BY-SA) ·

"efficient" is a 9-letter English headword indexed on PlainSpell.

The verdict

“efficient” is a regularly-used English word, ranked #3,484 in English word frequency and used as an adjective.

#3,484
frequency rank, English
9
letters
11
tracked misspellings
2
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

efficient vs efficiently
82% similar
efficient vs efficiency
80% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for efficient
PropertyValue
Headwordefficient
LanguageEnglish
Part of speechAdjective
IPA/ɪˈfɪʃənt/
Letters9
Frequency rank#3,484
Misspellings tracked11
Confusable pairs2
SourceWiktionary (kaikki.org)

Where “efficient” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). efficient lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for efficient is 9 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ɪˈfɪʃənt/. Corpus data places it at rank #3,484 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 4 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 11 likely wrong-spelling variants for efficient, with forms such as "effciient", "efficcient", and "efficeint". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 2 confusable-pair relationships, "efficiently", "efficiency", a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: 1398, “making,” from Old French, from Latin efficientem, nominative efficiēns, participle of efficere (“work out, accomplish”) (see effect). Meaning “productive, skilled” is from 1787. Efficiency apartment is first recorded 1930, American English. The correct English form is efficient, spelled E-F-F-I-C-I-E-N-T.

Definition

  1. 1
    Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.
  2. 2
    Expressing the proportion of consumed energy that was successfully used in a process; the ratio of useful output to total input.
  3. 3
    Causing effects, producing results; bringing into being; initiating change (rare except in philosophical and legal expression efficient cause = causative factor or agent).
  4. 4
    effective, efficacious

Etymology

1398, “making,” from Old French, from Latin efficientem, nominative efficiēns, participle of efficere (“work out, accomplish”) (see effect). Meaning “productive, skilled” is from 1787. Efficiency apartment is first recorded 1930, American English.

Synonyms

economicalefficaciousefficientpotent

Antonyms

inefficientprodigaluneconomical

This word in other languages

eficiente(Español)efficace(Français)effizient(Deutsch)eficiente(Português)

Common misspellings

Also misspelled as: effciient,efficcient,efficeint,efficiennt,efficientt,efficietn,efficinet,effiicent,eficient,efifcient,feficient

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of efficient - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

effciient2efficcient1efficeint2efficiennt1efficientt1efficietn2efficinet2effiicent2
Edit distance from "efficient"

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "efficient"?
"efficient" is spelled E-F-F-I-C-I-E-N-T. The IPA pronunciation is /ɪˈfɪʃənt/.
What does "efficient" mean?
As an adjective, "efficient" means: Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.
What words are commonly confused with "efficient"?
"efficient" is commonly confused with "efficiently", "efficiency". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "efficient"?
The IPA (International Phonetic Alphabet) transcription for "efficient" is /ɪˈfɪʃənt/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "efficient"?
1398, “making,” from Old French, from Latin efficientem, nominative efficiēns, participle of efficere (“work out, accomplish”) (see effect). Meaning “productive, skilled” is from 1787. Efficiency apartment is first recorded 1930, American English. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “efficient”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is E-F-F-I-C-I-E-N-T - every other letter order is a misspelling in standard orthography.
  • Say it as /ɪˈfɪʃənt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “efficiently” - see the side-by-side comparison. efficient vs efficiently
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list