Definition of Expertness

Babylon English Dictionary
skill, mastery, proficiency
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Expertness Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(n.)
Skill derived from practice; readiness; as, expertness in seamanship, or in reasoning.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
hEnglish - advanced version

expertness
\ex*pert"ness\, n. skill derived from practice; readiness; as, expertness in seamanship, or in reasoning.

JM Welsh <=> English Dictionary
Medraeth = n. expertness, skill
Medredd = n. expertness, skill
Medrusedd = n. expertness
WordNet 2.0

Noun
1. skillfulness by virtue of possessing special knowledge
(synonym) expertise
(hypernym) skillfulness
(hyponym) sophistication