functional

/ˈfʌŋkt͡ʃənəl/

//ˈfʌŋkt͡ʃənəl// adj

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

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

The verdict

“functional” is a regularly-used English word, ranked #4,761 in English word frequency and used as an adjective.

#4,761
frequency rank, English
10
letters
15
tracked misspellings
6
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - In good working order.

Visual similarity to commonly confused words

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

functional vs functions
80% similar
functional vs functionally
83% similar
functional vs function
80% similar

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

Key facts for functional
PropertyValue
Headwordfunctional
LanguageEnglish
Part of speechAdjective
IPA/ˈfʌŋkt͡ʃənəl/
Letters10
Frequency rank#4,761
Misspellings tracked15
Confusable pairs6
SourceWiktionary (kaikki.org)

Where “functional” 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). functional 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 functional is 10 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ˈfʌŋkt͡ʃənəl/. Corpus data places it at rank #4,761 in overall English word frequency, indicating it appears regularly in written and spoken text. Wiktionary records 8 distinct senses for this headword, so context determines which meaning a reader should apply.

Our generated misspelling index lists 15 likely wrong-spelling variants for functional, with forms such as "ffunctional", "fnuctional", and "fucntional". 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 6 confusable-pair relationships, "functions", "functionally", "function", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From function + -al. The correct English form is functional, spelled F-U-N-C-T-I-O-N-A-L.

Definition

  1. 1
    In good working order.
  2. 2
    Useful; serving a purpose, fulfilling a function.
  3. 3
    Only for functional purposes, notably in architecture.
  4. 4
    Of or relating to one's role or office; official.
  5. 5
    Characterizing functioning in environment, being symptoms that do not presuppose alteration of organic structure.
  6. 6
    Optimized for all-around physiological benefit.
  7. 7
    Of or relating to a function or functions.
  8. 8
    Having semantics defined purely in terms of mathematical functions, without side-effects.

Etymology

From function + -al.

Synonyms

functioningworkingutilitarianfunctionalin working orderoperational

Antonyms

dysfunctionalnon-functionalnonfunctionalunfunctionalorganicout of order

This word in other languages

operativo(Español)fonctionnel(Français)funktional(Deutsch)funcional(Português)

Common misspellings

Also misspelled as: ffunctional,fnuctional,fucntional,funcctional,funcitonal,functinoal,functioanl,functionall,functionla,functionnal,functoinal,functtional,funnctional,funtcional,ufnctional

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of functional - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

ffunctional1fnuctional2fucntional2funcctional1funcitonal2functinoal2functioanl2functionall1
Edit distance from "functional"

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 "functional"?
"functional" is spelled F-U-N-C-T-I-O-N-A-L. The IPA pronunciation is /ˈfʌŋkt͡ʃənəl/.
What does "functional" mean?
As an adjective, "functional" means: In good working order.
What words are commonly confused with "functional"?
"functional" is commonly confused with "functions", "functionally", "function". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "functional"?
The IPA (International Phonetic Alphabet) transcription for "functional" is /ˈfʌŋkt͡ʃənəl/. 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 "functional"?
From function + -al. 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 “functional”

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

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