AD
/ˌeɪˈdi/
"ad" is a 2-letter English headword indexed on PlainSpell.
The verdict
“AD” sits in 20 confusable pairs (corpus #1,779) as an adverb. The look-alike neighbours are the real trap.
- #1,779
- frequency rank, English
- 3,931
- “A” headwords
- 20
- confusable pairs
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of Anno Domini (borrowed from Latin); in the year of our Lord.
Corpus desk
Index EN-ad · AD · English
AD · rank #1,779 · 0 variants · 20 confusables
- FREQ-COMMON #1,779
- LEN-SHORT 2 letters
- VOW-1 1 vowel
- CONFUS-HIGH 20 pairs
- VAR-0 0 variants
- BOOK-MID 3,931
- PHOTO-FINISH units
Nearest frequency peer: units (-1 rank slots)
Read with this headword: Spelling guide for this pattern
Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.
Frequency neighbours of confusable “AD”
Peers at similar corpus weight, separate from look-alike pairs below
- thousands
thousands
98,225 corpus weight
- tough
tough
98,224 corpus weight
- units
units
98,223 corpus weight
- AD
AD
98,222 corpus weight
- alive
alive
98,221 corpus weight
- apple
apple
98,220 corpus weight
What this shows Bars place “AD” against nearest ranked English headwords, not a reprint of the confusable-pair desk.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | AD |
| Language | English |
| Part of speech | Adverb |
| IPA | /ˌeɪˈdi/ |
| Letters | 2 |
| Frequency rank | #1,779 |
| Misspellings tracked | 0 |
| Confusable pairs | 20 |
| Source | Wiktionary (kaikki.org) |
Corpus rank beside confusables of “AD”
Easy to mix with look-alikes
The spelling risk for AD is neighbouring look-alikes ("as", "at", …), not just typos; it is anadverb pronounced /ˌeɪˈdi/. Frequency #1,779 among 3,931 “A” headwords. Gloss: "Initialism of Anno Domini (borrowed from Latin); in the year of our Lord.".
AD has no tracked misspelling variants, and the word's spelling is regular enough that our generator found nothing worth flagging. It also participates in 20 confusable-pair relationships, "as", "at", "an", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.
This entry carries no recorded etymology, so its spelling is best read as a straightforward mapping from sound to letter. The correct English form is AD, spelled A-D.
Definition
- 1Initialism of Anno Domini (borrowed from Latin); in the year of our Lord.
Recorded use
Wiktionary examplesThese source excerpts show how AD appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
They had a vibrant culture from the 3rd century BC to the 2nd century AD.
Today is 9 March AD 2026.
Synonyms
This word in other languages
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.