English
superproficiency
From super- + proficiency.
Formed from super- + proficiency
Latin prōficiēns ‘advancing etc’
English proficiency
Today it means
noun Extreme proficiency.
Sources
Sources: Wiktionary, “superproficiency”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / superproficiency