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  2. Effectiveness - Wikipedia

    en.wikipedia.org/wiki/Effectiveness

    Antonyms for effectiveness include: uselessness, ineffectiveness. [13] Simply stated, effective means achieving an effect, and efficient means getting a task or job done it with little waste. To illustrate: suppose, you build 10 houses, very fast and cheap (efficient), but no one buy them.

  3. Opposite - Wikipedia

    en.wikipedia.org/wiki/Opposite

    An antonym is one of a pair of words with opposite meanings. Each word in the pair is the antithesis of the other. A word may have more than one antonym. There are three categories of antonyms identified by the nature of the relationship between the opposed meanings.

  4. Efficiency (disambiguation) - Wikipedia

    en.wikipedia.org/wiki/Efficiency_(disambiguation)

    Efficiency (finance), non-mean-variance portfolio analysis, a way of showing that a portfolio is not efficient; Efficiency (mechanical) Efficiency (network science), a measure of how efficiently a network exchanges information; Efficiency (statistics), a measure of quality of an estimator, experiment, or test

  5. Efficiency - Wikipedia

    en.wikipedia.org/wiki/Efficiency

    Efficient energy use, the objective of maximising efficiency In thermodynamics: Energy conversion efficiency, measure of second law thermodynamic loss; Radiation efficiency, ratio of radiated power to power absorbed at the terminals of an antenna; Volumetric efficiency, in internal combustion engine design for the RAF; Lift-to-drag ratio

  6. Contronym - Wikipedia

    en.wikipedia.org/wiki/Contronym

    A contronym is a word with two opposite meanings. For example, the word original can mean "authentic, traditional", or "novel, never done before". This feature is also called enantiosemy , [ 1 ] [ 2 ] enantionymy ( enantio- means "opposite"), antilogy or autoantonymy .

  7. Economic efficiency - Wikipedia

    en.wikipedia.org/wiki/Economic_efficiency

    The first fundamental welfare theorem provides some basis for the belief in efficiency of market economies, as it states that any perfectly competitive market equilibrium is Pareto efficient. The assumption of perfect competition means that this result is only valid in the absence of market imperfections , which are significant in real markets.

  8. Glossary of electrical and electronics engineering - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_electrical_and...

    energy efficient transformer A power transformer designed to have lower than average energy loss. energy returned on energy invested A measure of how long an energy producing system takes to replace the energy it took to make it. energy subsidies

  9. Thesaurus - Wikipedia

    en.wikipedia.org/wiki/Thesaurus

    Thesaurus Linguae Latinae. A modern english thesaurus. A thesaurus (pl.: thesauri or thesauruses), sometimes called a synonym dictionary or dictionary of synonyms, is a reference work which arranges words by their meanings (or in simpler terms, a book where one can find different words with similar meanings to other words), [1] [2] sometimes as a hierarchy of broader and narrower terms ...