A.D.

adv

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

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

The verdict

“A.D.” is outside the top-ranked English vocabulary, used as an adverb - the kind of word writers most often double-check.

Unranked
below top-frequency English
4
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Alternative form of AD; initialism of anno Domini.

Key facts for A.D.
PropertyValue
HeadwordA.D.
LanguageEnglish
Part of speechAdverb
Letters4
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “A.D.” sits in English frequency

A.D. falls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Spelling & Dictionary Insight

The English entry for A.D. is 4 letters long, classified as an adverb. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "Alternative form of AD; initialism of anno Domini.".

No misspelling variants are generated for A.D. in our index, which points to an orthography that plays by predictable English rules. This headword has no recorded confusable partner, suggesting its spelling stands apart enough that readers rarely confuse it with something else.

No borrowing history is documented for this entry, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is A.D., spelled A-.-D-..

Definition

  1. 1
    Alternative form of AD; initialism of anno Domini.

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "A.D."?
"A.D." is spelled A-.-D-..
What does "A.D." mean?
As an adverb, "A.D." means: Alternative form of AD; initialism of anno Domini.
What language does "A.D." come from?
"A.D." 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 “A.D.”

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

  • The one correct English spelling is A-.-D-. - 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