expertness

UK: /ˈekspɜːtnɪs/

WordReference Random House Learner's Dictionary of American English © 2025

ex•pert /ˈɛkspɜrt; adj. also ɪkˈspɜrt/   n. [countable]

1. a person who has special skill or knowledge in a particular field:
   a computer expert.

adj. 

2. possessing special skill or knowledge;
   trained by practice:
   She is an expert horseback rider.
3. [before a noun] relating to or characteristic of an expert:
   expert advice.

ex•pert•ly, adv. 
ex•pert•ness, n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

ex•pert  (n., v. ek′spûrt;adj. ek′spûrt, ik spûrt′), n. 

1. a person who has special skill or knowledge in some particular field;
   specialist;
   authority:
   a language expert.
2. Military
   • the highest rating in rifle marksmanship, above that of marksman and sharpshooter.
   • a person who has achieved such a rating.

adj. 

3. possessing special skill or knowledge;
   trained by practice;
   skillful or skilled (often fol. by in or at):
   an expert driver; to be expert at driving a car.
4. pertaining to, coming from, or characteristic of an expert:
   expert work; expert advice.

v.t. 

5. to act as an expert for.

• Latin expertus, past participle of experīrī to try, experience
• Middle English (adjective, adjectival) 1325–75

ex•pert′ly, adv. 
ex•pert′ness, n. 
Synonyms

• 1. connoisseur, master.
• 3. experienced, proficient, dexterous. See skillful. 

Antonyms

• 3. unskillful.