What does "efficient" mean?
A cause; something that causes an effect.
Efficient
/ɪˈfɪʃənt/ adj, noun
adj, noun ·Common ·Middle school level
Meaning at a glance
- Primary sense: A cause; something that causes an effect.
- Grammar: efficient is listed as adj, noun.
- Nearest alternatives: effective, able, active, adequate.
- Useful contrasts: feckless, inefficient, prodigal.
- Usage evidence: Can you guess which cooler is the most efficient?
How to use "efficient"
- Start with the primary definition, then check the part of speech before placing the word in a sentence.
- Compare nearby synonyms to make sure "efficient" carries the exact meaning, tone, and strength you need.
- Use the example sentence as a context check. If your sentence uses the word differently, confirm that the grammar still fits.
Meaning check
- Does the word fit the sentence's grammar?
- Does it match the intended tone rather than only the dictionary definition?
- Would a simpler synonym be clearer for the reader?
- Is there enough surrounding context to prevent ambiguity?
Source and review context
This entry combines structured lexical data with WordToolSet review checks. Definitions, examples, synonyms, and usage notes may come from different source tables, so the page is designed to show evidence from more than one angle before you rely on "efficient" in a final draft.
If a word has several senses, prefer the sense that matches your sentence's grammar and surrounding context. A correct definition can still be the wrong choice when the sentence needs a different register, emphasis, or level of specificity.
Before you rely on this definition
Read the first definition as a starting point, then check the example, synonyms, and part of speech before treating "efficient" as the right word for your sentence.
If your draft is formal, technical, persuasive, or sensitive, compare "efficient" with a nearby alternative so the final choice matches both meaning and reader expectation.
Compare nearby meanings
- Use synonyms when you need a softer, stronger, simpler, or more specific word.
- Use antonyms to check the boundary of the meaning and avoid accidental contrast.
- Use the example sentence to confirm the word behaves naturally in context.
- Keep the original wording when a replacement adds complexity without improving precision.
Definition decision workflow
1. Identify the role
Check whether "efficient" is acting as adj, noun in your sentence. A definition is only useful when the grammar matches the way the word is being used.
2. Test the nearest option
Compare it with "effective" and other nearby choices to see whether the sentence needs a softer, stronger, or more familiar word.
3. Confirm with context
Use the example sentence below as an evidence check, then read your own sentence out loud to catch tone or rhythm problems.
Review note: Definition pages are checked for source coverage, sentence evidence, synonym support, and editorial insight before they are treated as approval-ready pages. If the evidence is too thin, the page remains available to users but is kept out of the approval-facing indexed inventory.
Final meaning check
Before publishing a sentence with "efficient", ask whether the word helps the reader understand the idea faster. A precise word should reduce confusion, not simply make the sentence look more polished.
When the definition, synonym evidence, and example context point in the same direction, the word is usually a safer choice. When they conflict, revise the sentence or choose a clearer alternative.
Definitions
Noun
- 1 A cause; something that causes an effect. obsolete
"Some are without efficient, as God; others without matter, as Angels […]."
Adjective
- 1 Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.
"An efficient process would automate all the routine work."
- 2 Expressing the proportion of consumed energy that was successfully used in a process; the ratio of useful output to total input.
"The motor is only 20% efficient at that temperature."
- 3 Causing effects, producing results; bringing into being; initiating change (rare except in philosophical and legal expression efficient cause = causative factor or agent).
"Ownership, maintenance, or use of the automobile need not be the direct and efficient cause of the injury sustained"
- 4 effective, efficacious proscribed
"Ye wake no more to anguish;‥ ye have borne The Chosen, the Destroyer!‥ soon his hand Shall strike the efficient blow; Soon shaking off your penal forms, shall ye, With songs of joy, amid the Eden groves, Hymn the Deliverer’s praise!"
Adjective
- 1 able to accomplish a purpose; functioning effectively wordnet
- 2 being effective without wasting time or effort or expense wordnet
Synonyms
All synonymsExample
"Can you guess which cooler is the most efficient?"
Common questions
What is a synonym for "efficient"?
Common synonyms include: effective, able, active, adequate, amortized logarithmic complexity, analytical chemistry workflow.
How do you use "efficient" in a sentence?
Can you guess which cooler is the most efficient?
How do you pronounce "efficient"?
Pronounced /ɪˈfɪʃənt/.
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.