AIS

/ˈeɪ ˈaɪ ˈɛs/

//ˈeɪ ˈaɪ ˈɛs// noun

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

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

The verdict

“AIS” sits in 20 confusable pairs (corpus #26,670) as a noun. The look-alike neighbours are the real trap.

#26,670
frequency rank, English
3,931
“A” headwords
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Initialism of automatic identification system, as an element of the Global Marine Distress and Safety System GMDSS.

Corpus desk

Index EN-ais · AIS · English

AIS · rank #26,670 · 0 variants · 20 confusables

  • FREQ-MID #26,670
  • LEN-MID 3 letters
  • VOW-2 2 vowels
  • CONFUS-HIGH 20 pairs
  • VAR-0 0 variants
  • BOOK-MID 3,931
  • PHOTO-FINISH Aiden

Nearest frequency peer: Aiden (-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 “AIS”

Peers at similar corpus weight, separate from look-alike pairs below

corpus weight

What this shows Bars place “AIS” against nearest ranked English headwords, not a reprint of the confusable-pair desk.

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).

AIS vs as
0% similar
AIS vs at
0% similar
AIS vs an
0% similar

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

Key facts for AIS
PropertyValue
HeadwordAIS
LanguageEnglish
Part of speechNoun
IPA/ˈeɪ ˈaɪ ˈɛs/
Letters3
Frequency rank#26,670
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Corpus rank beside confusables of “AIS”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).AISlands here:

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “Aiden” (#26,669), “Alastair” (#26,671), “aegis” (#26,668). Among 3,931 “A” headwords, “AIS” is #26,670. Source: FrequencyWords open word-frequency list.

Easy to mix with look-alikes

The spelling risk for AIS is neighbouring look-alikes ("as", "at", …), not just typos; it is anoun pronounced /ˈeɪ ˈaɪ ˈɛs/. Frequency #26,670 among 3,931 “A” headwords. 4 recorded senses keep meaning in play.

The misspelling generator found no plausible variants for AIS, 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, where similar look or sound leads writers to substitute one word for another in context.

This entry's etymology isn't recorded, leaving phoneme-to-grapheme mapping as the best guide to its spelling rather than a borrowing history. The correct English form is AIS, spelled A-I-S.

Definition

  1. 1
    Initialism of automatic identification system, as an element of the Global Marine Distress and Safety System GMDSS.
  2. 2
    Initialism of Australian Illawarra Shorthorn (cattle breed).
  3. 3
    Abbreviation of androgen insensitivity syndrome.
  4. 4
    Initialism of artificial immune system.

Recorded use

Wiktionary example

These source excerpts show how AIS appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Having spotted an unknown contact on radar, the navigation officer attempted to identify the vessel using the ship's AIS.

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 "AIS"?
"AIS" is spelled A-I-S. The IPA pronunciation is /ˈeɪ ˈaɪ ˈɛs/.
What does "AIS" mean?
As a noun, "AIS" means: Initialism of automatic identification system, as an element of the Global Marine Distress and Safety System GMDSS.
What words are commonly confused with "AIS"?
"AIS" 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 "AIS"?
The IPA (International Phonetic Alphabet) transcription for "AIS" is /ˈeɪ ˈaɪ ˈɛs/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What language does "AIS" come from?
"AIS" is a English word. PlainSpell's reference spans five languages -- English, Spanish, Portuguese, French, and German -- with definitions, pronunciations, and spelling data for each.
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 "AIS", not the corpus desk frequency band.

Same letter count

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

BDS#26,691tum#26,641CFS#26,716CMA#26,726

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list