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.

efficient, effective

efficient

effective

third-person plural future active indicative of efficiō

Source: wiktionary.org