AF

/eɪ̯ˈɛf/

//eɪ̯ˈɛf// noun

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

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

The verdict

“AF” is a regularly-used English word, ranked #7,413 in English word frequency and used as a noun.

#7,413
frequency rank, English
2
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of air force.

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

AF vs as
0% similar
AF vs at
0% similar
AF vs an
0% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for AF
PropertyValue
HeadwordAF
LanguageEnglish
Part of speechNoun
IPA/eɪ̯ˈɛf/
Letters2
Frequency rank#7,413
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “AF” 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). AF 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 AF is 2 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /eɪ̯ˈɛf/. Corpus data places it at rank #7,413 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 8 distinct senses for this headword, so context determines which meaning a reader should apply.

The misspelling generator found no plausible variants for AF, since its letter pattern doesn't lend itself to common typo substitutions. It also participates in 20 confusable-pair relationships, "as", "at", "an", and more, where similar look or sound leads writers to substitute one word for another in context.

This entry carries no recorded etymology, so its spelling is best explained by sound-to-letter mapping rather than etymology. The correct English form is AF, spelled A-F.

Definition

  1. 1
    Initialism of air force.
  2. 2
    Initialism of alternative fact.
  3. 3
    Initialism of atrial fibrillation or auricular fibrillation.
  4. 4
    Initialism of autofocus.
  5. 5
    Initialism of adult female.
  6. 6
    Initialism of auditory feedback.
  7. 7
    Initialism of as found, also af, a/f.
  8. 8
    Initialism of aggression factor.

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 "AF"?
"AF" is spelled A-F. The IPA pronunciation is /eɪ̯ˈɛf/.
What does "AF" mean?
As a noun, "AF" means: Initialism of air force.
What words are commonly confused with "AF"?
"AF" is commonly confused with "as", "at", "an". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "AF"?
The IPA (International Phonetic Alphabet) transcription for "AF" is /eɪ̯ˈɛf/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "AF" come from?
"AF" 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 “AF”

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

  • The one correct English spelling is A-F - every other letter order is a misspelling in standard orthography.
  • Say it as /eɪ̯ˈɛf/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “as” - see the side-by-side comparison. AF vs as
  • 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