complement

/ˈkɒmpləmənt/

//ˈkɒmpləmənt// noun

"complement" is a 10-letter English headword indexed on PlainSpell.

The verdict

“complement” is a moderately-common English word, ranked #10,019 in English word frequency and used as a noun.

#10,019
frequency rank, English
10
letters
16
tracked misspellings
5
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The totality, the full amount or number which completes something.

Visual similarity to commonly confused words

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

complement vs compliment
90% similar
complement vs compliments
82% similar
complement vs complemented
83% similar

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

Key facts for complement
PropertyValue
Headwordcomplement
LanguageEnglish
Part of speechNoun
IPA/ˈkɒmpləmənt/
Letters10
Frequency rank#10,019
Misspellings tracked16
Confusable pairs5
SourceWiktionary (kaikki.org)

Where “complement” 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). complement 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 complement is 10 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈkɒmpləmənt/. Corpus data places it at rank #10,019 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 22 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 16 likely wrong-spelling variants for complement, with forms such as "ccomplement", "cmoplement", and "comlpement". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 5 confusable-pair relationships, "compliment", "compliments", "complemented", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Middle English complement, from Latin complēmentum (“that which fills up or completes”), from compleō (“to fill up; to complete”) (English complete). Doublet of compliment. The verb is from the noun. The correct English form is complement, spelled C-O-M-P-L-E-M-E-N-T.

Definition

  1. 1
    The totality, the full amount or number which completes something.
  2. 2
    The whole working force of a vessel.
  3. 3
    An angle which, together with a given angle, makes a right angle.
  4. 4
    Something which completes, something which combines with something else to make up a complete whole; loosely, something perceived to be a harmonious or desirable partner or addition.
  5. 5
    A word or group of words that completes a grammatical construction in the predicate and that describes or is identified with the subject or object.
  6. 6
    A phonetic complement is a graphic element that modifies another, such as (in Linear B script) a small syllabogram that is attached to a logogram as an abbreviation of its reading (as opposed to an adjunct that abbreviates an adjective that modifies that logogram).
  7. 7
    An interval which, together with the given interval, makes an octave.
  8. 8
    The color which, when mixed with the given color, gives black (for mixing pigments) or white (for mixing light).
  9. 9
    Given two sets, the set containing one set's elements that are not members of the other set (whether a relative complement or an absolute complement).
  10. 10
    One of several blood proteins that work with antibodies during an immune response.
  11. 11
    An expression related to some other expression such that it is true under the same conditions that make other false, and vice versa.
  12. 12
    A voltage level with the opposite logical sense to the given one.
  13. 13
    A bit with the opposite value to the given one; the logical complement of a number.
  14. 14
    The diminished radix complement of a number; the nines' complement of a decimal number; the ones' complement of a binary number.
  15. 15
    The radix complement of a number; the two's complement of a binary number.
  16. 16
    The numeric complement of a number.
  17. 17
    A nucleotide sequence in which each base is replaced by the complementary base of the given sequence: adenine (A) by thymine (T) or uracil (U), cytosine (C) by guanine (G), and vice versa.
  18. 18
    Synonym of alexin.
  19. 19
    Abbreviation of complementary good.
  20. 20
    Something (or someone) that completes; the consummation.
  21. 21
    The act of completing something, or the fact of being complete; completion, completeness, fulfilment.
  22. 22
    Something which completes one's equipment, dress etc.; an accessory.

Etymology

From Middle English complement, from Latin complēmentum (“that which fills up or completes”), from compleō (“to fill up; to complete”) (English complete). Doublet of compliment. The verb is from the noun.

This word in other languages

Common misspellings

Also misspelled as: ccomplement,cmoplement,comlpement,commplement,compelment,compleemnt,complemennt,complementt,complemetn,complemment,complemnet,compllement,complmeent,compplement,copmlement,ocmplement

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of complement - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

ccomplement1cmoplement2comlpement2commplement1compelment2compleemnt2complemennt1complementt1
Edit distance from "complement"

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 "complement"?
"complement" is spelled C-O-M-P-L-E-M-E-N-T. The IPA pronunciation is /ˈkɒmpləmənt/.
What does "complement" mean?
As a noun, "complement" means: The totality, the full amount or number which completes something.
What words are commonly confused with "complement"?
"complement" is commonly confused with "compliment", "compliments", "complemented". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "complement"?
The IPA (International Phonetic Alphabet) transcription for "complement" is /ˈkɒmpləmənt/. 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 "complement"?
From Middle English complement, from Latin complēmentum (“that which fills up or completes”), from compleō (“to fill up; to complete”) (English complete). Doublet of compliment. The verb is from the noun. 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.

Using “complement”

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

  • The one correct English spelling is C-O-M-P-L-E-M-E-N-T - every other letter order is a misspelling in standard orthography.
  • Say it as /ˈkɒmpləmənt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
  • Don't mix it up with “compliment” - see the side-by-side comparison. complement vs compliment
  • 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