efficient vs effective

efficient

Definitions

adjective

  1. being effective without wasting time or effort or expense
  2. able to accomplish a purpose; functioning effectively

Examples

Forbes: In terms of scale, the size of a bank for lending, is there a point where being bigger does not make you more efficient in lending?

The art of writing a good chess program is thinking of efficient short cuts through the search-space.

Making an efficient icebox was not as easy as we might now suppose.

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effective

Definitions

adjective

  1. ready for service
  2. works well as a means or remedy
  3. able to accomplish a purpose; functioning effectively
  4. producing or capable of producing an intended result or having a striking effect
  5. existing in fact; not theoretical; real
and more 1 ...

Examples

On the ranges of Fort Devens, the troops were put through their paces on US weapons, from the stock-in-trade M16 assault rifle to the frighteningly-effective M249 SAW light machine gun.

Particulates and dust in Earth's atmosphere along the line of sight tend to absorb blue light more effectively than red light.

Thus, developing a vaccine directed against one or a few capsular polysaccharides may not be widely effective.

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