What is the meaning of Efficient?

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

expressing the proportion of consumed energy that was successfully used in a process; the ratio of useful output to total input

causing effects, producing results; bringing into being; initiating change (rare except in philosophical and legal expression efficient cause = causative factor or agent)

effective, efficacious

a cause; something that causes an effect

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efficient

effective

third-person plural future active indicative of efficiƍ

Source: wiktionary.org