Expertness

noun

Definitions

Noun
  1. 1
    The state of being expert. uncountable, usually
  2. 2
    skillfulness by virtue of possessing special knowledge wordnet
  3. 3
    Proficiency or skill. uncountable, usually

    "I had […] armed myself with a revolver, in the use of which I finally reached a certain degree of expertness from frequent practice."

Etymology

From expert + -ness.

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