facility, skill, talent, adeptness, expertise, expertness, skilfulness, aptitude, capability, ability, dexterity, capability, competence or competency, ingenuity, knack, savoir faire, Colloq know-how:
The proficiency he displayed as a racing-car driver was second to none.
considerable, great | technical | language, oral, reading, written | cycling, skiing, etc.
He taught himself to carve to a high degree of proficiency.
VERB + PROFICIENCY
acquire, develop, increase
He acquired greater proficiency after a three-month intensive course.
| demonstrate, show
PROFICIENCY + NOUN
a language proficiency test
a certificate for proficiency in English
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