arc

/ɑːk/

//ɑːk// noun

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

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

The verdict

“arc” sits in 20 confusable pairs (corpus #5,005) as a noun. The look-alike neighbours are the real trap.

#5,005
frequency rank, English
3,931
“A” headwords
20
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - That part of a circle which a heavenly body appears to pass through as it moves above and below the horizon.

Corpus desk

Index EN-arc · arc · English

arc · rank #5,005 · 0 variants · 20 confusables

  • FREQ-COMMON #5,005
  • LEN-MID 3 letters
  • VOW-1 1 vowel
  • CONFUS-HIGH 20 pairs
  • VAR-0 0 variants
  • BOOK-MID 3,931
  • PHOTO-FINISH aims

Nearest frequency peer: aims (-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 “arc”

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

corpus weight

What this shows Bars show where “arc” 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).

arc vs as
33% similar
arc vs at
33% similar
arc vs aw
33% similar

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

Key facts for arc
PropertyValue
Headwordarc
LanguageEnglish
Part of speechNoun
IPA/ɑːk/
Letters3
Frequency rank#5,005
Misspellings tracked0
Confusable pairs20
SourceWiktionary (kaikki.org)

Where “arc” sits in English frequency

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).arclands here:

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

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “aims” (#5,004), “backup” (#5,006), “advocate” (#5,003). Source: FrequencyWords open word-frequency list.

Easy to mix with look-alikes

The spelling risk for arc is neighbouring look-alikes ("as", "at", …), not just typos; it is anoun pronounced /ɑːk/. Frequency #5,005 among 3,931 “A” headwords. 11 recorded senses keep meaning in play.

No misspelling variants are generated for arc in our index, since its letter sequence doesn't invite the usual edit-distance slips. It also participates in 20 confusable-pair relationships, "as", "at", "aw", and more, since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: Etymology tree Proto-Indo-European *h₂erkʷ- Proto-Indo-European *h₂erkʷos Proto-Italic *arkuos Latin arcus Old French arcbor. Middle English ark English arc Inherited from Middle English ark, from Old French arc, from Latin arcus (“a bow, arc, arch”), ultim… The correct English form is arc, spelled A-R-C.

Definition

  1. 1
    That part of a circle which a heavenly body appears to pass through as it moves above and below the horizon.
  2. 2
    A continuous part of the circumference of a circle (circular arc) or of another curve.
  3. 3
    A curve, in general.
  4. 4
    A band contained within parallel curves, or something of that shape.
  5. 5
    A flow of current across an insulating medium; especially a hot, luminous discharge either between two electrodes or as lightning.
  6. 6
    Ellipsis of story arc.
  7. 7
    Ellipsis of story arc.
  8. 8
    A continuous mapping from a real interval (typically [0, 1]) into a space.
  9. 9
    A directed edge.
  10. 10
    The three-point line.
  11. 11
    An arclight.

Recorded use

Wiktionary examples

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

  1. For while most comics have designated entry points into the story in the form of arcs, Homestuck is one elaborate, self-referencing inside joke collapsed inside its own funhouse mirror reflection.
  2. I'm hitting the gym three times a week or more at the moment. I'm in my gym bro arc.

Etymology

Etymology tree Proto-Indo-European *h₂erkʷ- Proto-Indo-European *h₂erkʷos Proto-Italic *arkuos Latin arcus Old French arcbor. Middle English ark English arc Inherited from Middle English ark, from Old French arc, from Latin arcus (“a bow, arc, arch”), ultimately from Proto-Indo-European *h₂erkʷos (“bow, arrow”). Doublet of arch, arco, and arrow.

Synonyms

curveswoopcircular arccircle segmentarrowdirected edge

This word in other languages

arco(Español)arc(Français)Bogen(Deutsch)arco(Português)

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 "arc"?
"arc" is spelled A-R-C. The IPA pronunciation is /ɑːk/.
What does "arc" mean?
As a noun, "arc" means: That part of a circle which a heavenly body appears to pass through as it moves above and below the horizon.
What words are commonly confused with "arc"?
"arc" is commonly confused with "as", "at", "aw". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "arc"?
The IPA (International Phonetic Alphabet) transcription for "arc" is /ɑːk/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "arc"?
Etymology tree Proto-Indo-European *h₂erkʷ- Proto-Indo-European *h₂erkʷos Proto-Italic *arkuos Latin arcus Old French arcbor. Middle English ark English arc Inherited from Middle English ark, from Old French arc, from Latin arcus (“a bow, arc, arc... 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.

Similar English words by spelling shape

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

Same letter count

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

WTF#5,000CIA#5,013ugh#4,993sue#4,985

What to do next

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

  • "arc" maps to 20 confusable pairs in this vintage; the highest-scored is "as". View pair
  • Usage frequency rank #5,005 among English headwords in this corpus. Corpus statistics
  • Browse more English words in the "A" letter cohort. A–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