proficiency
proficiency | Origin and meaning of proficiency by Online Etymology Dictionary
1540s, probably from abstract noun suffix
-cy
+ Latin
proficientem
(nominative
proficiens
), present participle of
proficere
"
accomplish
,
make progress
; be
useful
, do
good
; have
success
,
profit
," from pro "
forward
" (see
pro-
) + combining form of
facere
"to
make
,
do
" (from PIE root *dhe- "to set, put").
https://gyazo.com/81f14ae7a5c9d1ba30242fde697ff1e2
source: [輪るピングドラムのペンギン１号がきゅうりを高速で輪切りにするGIF画像｜無料GIF画像検索 GIFMAGAZINE
78790]
noun
a
high
degree
of
competence
or
skill
;
expertise
: 能力やスキルの高度な度合い; 専門的技術
«…の» 熟達, 技量 «in, at, of» .
e.g.
he demonstrated his proficiency in Chinese.: 彼は中国語の技量を実演した。