Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The property of being effective
  • n. The ability to be effective.
  • n. The degree to which something is effective.

from the GNU version of the Collaborative International Dictionary of English

  • n. The quality of being effective.

from The Century Dictionary and Cyclopedia

  • n. The quality of being effective.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. power to be effective; the quality of being able to bring about an effect
  • n. capacity to produce strong physiological or chemical effects

Etymologies

effective +‎ -ness (Wiktionary)

Examples

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