a1

Name: a1, English Word Data
Creator: Wiktionary
License: https://creativecommons.org/licenses/by-sa/4.0/

adj

By PlainSpell · According to Wiktionary data (CC BY-SA) · analyzed September 3, 2026

The verdict

“a1” sits in 20 confusable pairs (corpus #12,173) as an adjective. The look-alike neighbours are the real trap.

#12,173
frequency rank, English: 3,931
“A” headwords: 20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - first rate or excellent

Corpus desk

Index EN-a1 · a1 · English

a1 · rank #12,173 · 0 variants · 20 confusables

FREQ-MID #12,173
LEN-SHORT 2 letters
VOW-1 1 vowel
CONFUS-HIGH 20 pairs
VAR-0 0 variants
BOOK-MID 3,931
PHOTO-FINISH zinc

Nearest frequency peer: zinc (-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.

withstand

87,831
woodland

87,830
zinc

87,829
a1

87,828
accustomed

87,827
adequately

87,826

What this shows Bars place “a1” 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).

a1 vs as

50% similar

a1 vs at

50% similar

a1 vs an

50% similar

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

Key facts for a1
Property	Value
Headword	a1
Language	English
Part of speech	Adjective
Letters	2
Frequency rank	#12,173
Misspellings tracked	0
Confusable pairs	20
Source	Wiktionary (kaikki.org)

Corpus rank beside confusables of “a1”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).a1lands here:

#12,173

#1#100#1K#10K#100K

← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “zinc” (#12,172), “accustomed” (#12,174), “woodland” (#12,171). Among 3,931 “A” headwords, “a1” is #12,173. Source: FrequencyWords open word-frequency list.

Easy to mix with look-alikes

The spelling risk for a1 is neighbouring look-alikes ("as", "at", …), not just typos; it is anadjective. Frequency #12,173 among 3,931 “A” headwords. 2 recorded senses keep meaning in play.

No generated misspelling entries exist for a1 in our index, 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, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: The symbol used for a first-class vessel in Lloyd's Register of Shipping. The correct English form is a1, spelled A-1.

Definition

1
first rate or excellent
2
in first class condition

Etymology

The symbol used for a first-class vessel in Lloyd's Register of Shipping.

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 "a1"?

"a1" is spelled A-1.

What does "a1" mean?

As an adjective, "a1" means: first rate or excellent

What words are commonly confused with "a1"?

"a1" is commonly confused with "as", "at", "an". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.

What is the origin of the word "a1"?

The symbol used for a first-class vessel in Lloyd's Register of Shipping. See the full etymology section above for more details.

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.