proficiency

[ pruh-fish-uh n-see ]

/ prəˈfɪʃ ən si /

the state of being proficient; skill; expertness: proficiency in music.

Origin of proficiency

1535–45; < Latin prōfici(ēns) proficient + -ency

o·ver·pro·fi·cien·cy, noun

There is simply no substitute for the experience and proficiency of a properly trained pilot.

Asiana Flight 214: The Pilot Screwed Up, Right? |Clive Irving |July 12, 2013 |DAILY BEAST
There was a lot of farm labor [in his upbringing], and there was a proficiency in splitting rails.

‘Abraham Lincoln: Vampire Hunter’: Seth Grahame-Smith on Its Real-Life Origins |Chris Lee |June 22, 2012 |DAILY BEAST
But the law also allowed each state to determine its own proficiency standard.

Still “Lying to Children”: How No Child Left Behind Corrupted Education |Sol Stern |January 9, 2012 |DAILY BEAST
It is a known fact that the more years of experience a controller has, the higher his proficiency.

An Air Traffic Controller Speaks |Bob Richards |April 30, 2011 |DAILY BEAST

I wonder whether Eve, when she came to Adam in the garden, brought with her a certificate of proficiency in the seven sciences?

Hypatia |Charles Kingsley
A part of my earnings was dedicated to an Italian class which I attended twice a week, and rapidly acquired some proficiency.

Memoirs of the Life of Sir Walter Scott, Volume I (of 10) |John Gibson Lockhart
In the arts of fencing and dancing, small indeed was my proficiency; and some months were idly wasted in the riding-school.

Memoirs of My Life and Writings |Edward Gibbon
His plan was to remain with the master long enough so he could secure a certificate of proficiency.

Little Journeys To The Homes Of Great Teachers |Elbert Hubbard
That was a proficiency that tempted me; and I practised to acquire it, as men learn to whittle, in a wager with myself.

Memories and Portraits |Robert Louis Stevenson