- Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.
Etymology: wikipedia:1398, 1398, "making," from Latin efficientem (nominative efficiens), preposition of efficere "work out, accomplish" (see effect). Meaning "productive, skilled" is from wikipedia:1787, 1787. Efficiency apartment is first recorded wikipedia:1930, 1930, American English. <ref>Wikipedia:Online Etymology Dictionary, Online Etymology Dictionary http://www.etymonline.com/index.php?search=efficient&searchmode=none</ref>
- An process would automate all the routine work.
- Using a particular proportion of available energy.
- The motor is only 20% at that temperature.
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