English

expertness

From expert + -ness.

A compound of expert + -ness

Proto-Indo-European *perh₃- ‘to provide’

…

Latin experior ‘to try’

Latin expertus ‘experienced’

Old French expert ‘experienced’

Middle English expert

Today it means

noun The state of being expert: high proficiency, high skill.

Language periods are conventional ranges, not dates for this word.

Etymograph / expertness