from The American Heritage® Dictionary of the English Language, 5th Edition.
- adjective Acting or producing effectively with a minimum of waste, expense, or unnecessary effort.
- adjective Acting directly to produce an effect.
- adjective Causing less waste or requiring less effort than comparable devices or methods. Used in combination.
from The Century Dictionary.
- 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.
- noun An efficient cause (see above).
- noun 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.
- noun In mathematics, a quantity multiplied by another quantity to produce the quantity of which it is said to be an efficient; a factor.
from the GNU version of the Collaborative International Dictionary of English.
- noun An efficient cause; a prime mover.
- adjective 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.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective Making good,
thorough, or careful use of resources; not consumingextra. Especially, making good use of timeor energy.
- adjective Using a particular
proportionof available energy.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective able to accomplish a purpose; functioning effectively
- adjective being effective without wasting time or effort or expense
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
If he left the "road" and became a _very_ efficient common laborer, some _ordinarily efficient_ common laborer would have to take to the "road."
Now, when the advocates of free-agency insist that motive is not the efficient cause of volition, and that mind is the efficient cause thereof, we suppose them to employ the expression, _efficient cause_, in one and the same sense in both branches of the proposition.
 I use the term efficient in a technical sense, as meaning all-sufficient to produce the given effect, without the intervention of any other cause.
That isn't to deny that a war with tens of thousands of people doesn't have a significant administrative overhead; rather, that focusing on this overhead (which laughs at the term efficient) ends up seriously degrading our ability to actually achieve victory.
Sure, the critique depends on misinterpreting what the word "efficient" means, as in the "efficient markets hypothesis."
If you believe in efficient markets you should also believe in the toothfairy.
If you believe in efficient markets, then you should be very skeptical of the rest of this post.
How efficient is it in transporting gun, hunter, and game out of the woods that may be hilly, have rough terrain, etc
All we need to do to make the health care system cheaper and more efficient is to remove the dilution of responsibility and cost, thus rewarding people who eat right, stay healthy, and live risk-averse lives.
Investing in efficient and clean energy creates jobs in manufacturing, sales, installation, and servicing of wind turbines, solar panels, and super efficient buildings.