efficiency

noun ef·fi·cien·cy \ i-ˈfi-shən-sē \
Updated on: 12 Dec 2017

Definition of efficiency

plural efficiencies
1 : the quality or degree of being efficient
2 a : efficient operation
b (1) : effective operation as measured by a comparison of production with cost (as in energy, time, and money)
(2) : the ratio of the useful energy delivered by a dynamic system to the energy supplied to it

Examples of efficiency in a Sentence

  1. Because of her efficiency, we got all the work done in a few hours.

  2. The factory was operating at peak efficiency.

  3. A furnace with 80 percent fuel efficiency wastes 20 percent of its fuel.

  4. The company is trying to lower costs and improve efficiencies.

Recent Examples of efficiency from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'efficiency.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of efficiency

1633


EFFICIENCY Defined for English Language Learners

efficiency

noun

Definition of efficiency for English Language Learners

  • : the ability to do something or produce something without wasting materials, time, or energy : the quality or degree of being efficient ( technical )


EFFICIENCY Defined for Kids

efficiency

noun ef·fi·cien·cy \ i-ˈfi-shən-sē \

Definition of efficiency for Students

plural efficiencies
: the ability to do something or produce something without waste


Seen and Heard

What made you want to look up efficiency? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

to make fruitful or productive

Get Word of the Day daily email!

Test Your Vocabulary

Star Wars Words Quiz

  • cu-jedi-training
  • The bounty portion of bounty hunters (such as Boba Fett) comes from a Latin word meaning
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!