ADR

/eɪ di ˈɑɹ/

//eɪ di ˈɑɹ// noun

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

"adr" is a 3-letter English headword indexed on PlainSpell.

The verdict

“ADR” is a moderately-common English word, ranked #35,173 in English word frequency and used as a noun.

#35,173
frequency rank, English
3
letters
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Initialism of adverse drug reaction.

Visual similarity to commonly confused words

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

ADR vs as
0% similar
ADR vs at
0% similar
ADR vs an
0% similar

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

Key facts for ADR
PropertyValue
HeadwordADR
LanguageEnglish
Part of speechNoun
IPA/eɪ di ˈɑɹ/
Letters3
Frequency rank#35,173
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “ADR” 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). ADR 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 ADR is 3 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /eɪ di ˈɑɹ/. Corpus data places it at rank #35,173 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. 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 ADR, typically a sign the spelling maps closely to how the word sounds. It also participates in 20 confusable-pair relationships, "as", "at", "an", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

No explicit etymology string is stored for this entry, so its spelling pattern is best understood through pronunciation rather than a traceable origin. The correct English form is ADR, spelled A-D-R.

Definition

  1. 1
    Initialism of adverse drug reaction.
  2. 2
    Initialism of alternative dispute resolution.
  3. 3
    Initialism of American depositary receipt.
  4. 4
    Initialism of automatic dialogue replacement.
  5. 5
    Initialism of additional/audio dialogue replacement.
  6. 6
    Initialism of ain't doin' right (the situation where an animal appears unwell but has not yet been diagnosed with any specific illness).
  7. 7
    Initialism of architectural decision record.
  8. 8
    Initialism of air data reference.

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 "ADR"?
"ADR" is spelled A-D-R. The IPA pronunciation is /eɪ di ˈɑɹ/.
What does "ADR" mean?
As a noun, "ADR" means: Initialism of adverse drug reaction.
What words are commonly confused with "ADR"?
"ADR" 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 "ADR"?
The IPA (International Phonetic Alphabet) transcription for "ADR" is /eɪ di ˈɑɹ/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "ADR" come from?
"ADR" is a English word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
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 “ADR”

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

  • The one correct English spelling is A-D-R - every other letter order is a misspelling in standard orthography.
  • Say it as /eɪ di ˈɑɹ/ (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. ADR 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