DOS

/diː oː ˈɛs/

//diː oː ˈɛs// noun

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

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

The verdict

“DOS” sits in 20 confusable pairs (corpus #11,370) as a noun. The look-alike neighbours are the real trap.

#11,370
frequency rank, English
3,470
“D” headwords
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of date of service.

Corpus desk

Index EN-dos · DOS · English

DOS · rank #11,370 · 0 variants · 20 confusables

  • FREQ-MID #11,370
  • LEN-MID 3 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-0 0 variants
  • BOOK-MID 3,470
  • PHOTO-FINISH drained

Nearest frequency peer: drained (+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 neighbourhood for “DOS”

Lower corpus rank = more everyday usage (inverted bar length for readability)

corpus weight

What this shows Bars show where “DOS” sits against the nearest ranked English headwords in the FrequencyWords band, not a reprint of letter-browse containment.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

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

DOS vs Dr
33% similar
DOS vs DS
67% similar
DOS vs DT
33% similar

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

Key facts for DOS
PropertyValue
HeadwordDOS
LanguageEnglish
Part of speechNoun
IPA/diː oː ˈɛs/
Letters3
Frequency rank#11,370
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “DOS” 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). DOS lands here:

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

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

Easy to mix with look-alikes

The spelling risk for DOS is neighbouring look-alikes ("Dr", "DS", …), not just typos; it is anoun pronounced /diː oː ˈɛs/. Frequency #11,370 among 3,470 “D” headwords. 7 recorded senses keep meaning in play.

We couldn't generate a plausible misspelling set for DOS, suggesting the orthography follows predictable English patterns. It also participates in 20 confusable-pair relationships, "Dr", "DS", "DT", 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 is best read as a straightforward mapping from sound to letter. The correct English form is DOS, spelled D-O-S.

Definition

  1. 1
    Initialism of date of service.
  2. 2
    Initialism of date of separation.
  3. 3
    Initialism of denial of service.
  4. 4
    Initialism of density of states.
  5. 5
    Initialism of director of studies.
  6. 6
    Initialism of disk operating system
  7. 7
    Initialism of death on scene.

This word in other languages

DOS(Français)

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.

PlainSpell is rendered directly from structured Wiktionary extracts and open word-frequency lists, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of September 3, 2026. Primary sources: Wiktionary (via kaikki.org) and FrequencyWords.

Frequently Asked Questions

How do you spell "DOS"?
"DOS" is spelled D-O-S. The IPA pronunciation is /diː oː ˈɛs/.
What does "DOS" mean?
As a noun, "DOS" means: Initialism of date of service.
What words are commonly confused with "DOS"?
"DOS" is commonly confused with "Dr", "DS", "DT". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "DOS"?
The IPA (International Phonetic Alphabet) transcription for "DOS" is /diː oː ˈɛs/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "DOS" come from?
"DOS" 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "DOS", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 3 letters (nearest by frequency rank).

apt#11,337Zen#11,330UTC#11,316rot#11,285

What to do next

You've looked up "DOS". Here's where to go from here.

  • "DOS" maps to 20 confusable pairs in this vintage; the highest-scored is "Dr". View pair
  • Usage frequency rank #11,370 among English headwords in this corpus. Corpus statistics
  • Browse more English words in the "D" letter cohort. D–Z browse
  • PlainSpell rotates a curated Word of the Day from the English corpus, a passive way to discover vocabulary. Word of the Day

PlainSpell is a reference corpus, not spelling advice. Verify unusual forms in context.

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