Efficient

Adjective

  • Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.

    "Our cleaners are almost too efficient: they throw away anything left out on a desk."

  • (proscribed, old use) Effective.
  • 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."

  • 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"

  • 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."

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