A1C

noun

By · According to Wiktionary data (CC BY-SA) ·

"a1c" is a 2-letter English headword indexed on PlainSpell.

The verdict

“A1C” is an uncommon English word, ranked #65,660 in English word frequency and used as a noun.

#65,660
frequency rank, English
3
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Abbreviation of airman 1st class.

Key facts for A1C
PropertyValue
HeadwordA1C
LanguageEnglish
Part of speechNoun
Letters3
Frequency rank#65,660
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “A1C” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). A1C lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for A1C is 3 letters long, classified as a noun. Corpus data places it at rank #65,660 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 3 distinct senses for this headword, so context determines which meaning a reader should apply.

A1C has no tracked misspelling variants, suggesting the orthography follows predictable English patterns. No close-neighbour confusable shows up for this headword in our dataset, suggesting its spelling stands apart enough that readers rarely confuse it with something else.

Our source data has no etymology on file for this entry, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is A1C, spelled A-1-C.

Definition

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

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "A1C"?
"A1C" is spelled A-1-C.
What does "A1C" mean?
As a noun, "A1C" means: Abbreviation of airman 1st class.
What language does "A1C" come from?
"A1C" is a English word. You can look up definitions, pronunciations, and spelling data for this and other words across English, Spanish, Portuguese, French, and German on PlainSpell.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “A1C”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is A-1-C - every other letter order is a misspelling in standard orthography.
  • Browse more English words and confusable pairs in the same reference. English words
Data Source

Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list