from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Acting directly to produce an effect: an efficient cause. See Synonyms at effective.
- adj. Acting or producing effectively with a minimum of waste, expense, or unnecessary effort.
- adj. Exhibiting a high ratio of output to input.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Making good, thorough, or careful use of resources; not consuming extra. Especially, making good use of time or energy.
- adj. Using a particular proportion of available energy.
from the GNU version of the Collaborative International Dictionary of English
- adj. Causing effects; producing results; that makes the effect to be what it is; actively operative; not inactive, slack, or incapable; characterized by energetic and useful activity.
- n. An efficient cause; a prime mover.
from The Century Dictionary and Cyclopedia
- Producing outward effects; of a nature to produce a result; active; causative.
- Acting or able to act with due effect; adequate in performance; bringing to bear the requisite knowledge, skill, and industry; capable; competent: as, an efficient workman, director, or commander.
- Synonyms Efficacious, Effectual, etc. (see effective); energetic, operative, active, ready, helpful.
- n. An efficient cause (see above).
- n. One who is efficient or qualified; specifically, in the volunteer service of Great Britain, one who has attended the requisite number of drills, and in respect of whom the corps receives the capitation grant paid by government.
- n. In mathematics, a quantity multiplied by another quantity to produce the quantity of which it is said to be an efficient; a factor.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. able to accomplish a purpose; functioning effectively
- adj. being effective without wasting time or effort or expense
Middle English, from Old French, from Latin efficiēns, efficient-, present participle of efficere, to effect; see effect.(American Heritage® Dictionary of the English Language, Fourth Edition)
1398, "making," from Latin efficientem (nominative efficiens), preposition of efficere "work out, accomplish" (see effect). Meaning "productive, skilled" is from 1787. Efficiency apartment is first recorded 1930, American English. (Wiktionary)