# A1C

> English word · Noun · frequency rank #65,660

## Definitions
1. Abbreviation of airman 1st class.
2. Ellipsis of hemoglobin A1c (“glycated hemoglobin”).
3. Ellipsis of A1C receptor (“alpha-1C adrenergic receptor”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/a1c