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quantum

/ˈkwɑntəm/noun, adjective

quantum is spelled Q-U-A-N-T-U-M: 7 letters and 2 syllables. It appears 12 times per million words in written English, the 6,347th most frequent word form (wordfreq, 2021 data). As a noun, quantum means “The total amount of something; quantity” (English Wiktionary, September 2026). The plural of quantum is quantums or quanta.

How many letters and syllables are in quantum?

Letters7: Q-U-A-N-T-U-M
Syllables2 (from its American pronunciation)
In writing12 times per million words; the 6,347th most frequent word form
Wrong spellings searchednone measured in search

Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).

How common is quantum?

Quantum appears 12 times per million words in written English, the 6,347th most frequent word form in the list.

Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).

How do you pronounce quantum?

  • UK /ˈkwɒntəm/
  • US /ˈkwɑntəm/
  • [ˈkʰwɑ̃ntʰə̃m]

Quantum has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-US_quantum_(enunciated).ogg, En-US_quantum_(flapped).ogg, Wikimedia Commons (author and licence on each file's page).

Forms of quantum

  • quantums plural
  • quanta plural

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What does quantum mean?

The meanings the English Wiktionary records, quoted as written there (source below).

noun

  1. 1

    The total amount of something; quantity.

  2. 2

    The amount of compensation awarded to a successful party in a lawsuit.

  3. 3

    The length or magnitude of the sentence handed down to someone who has been found guilty of a crime.

  4. 4

    The amount or quantity observably present, or available.

  5. 5

    The smallest possible, and therefore indivisible, unit of a given quantity or quantifiable phenomenon.

  6. 6

    The amount of time allocated for a thread to perform its work in a multithreaded environment.

  7. 7

    Ellipsis of quantum computing.

    Developing for quantum has never been more accessible.

  8. 8

    The minimum dose of a pathogen required to cause an infection.

adjective

  1. 1

    Of a change, sudden or discrete, without intermediate stages.

  2. 2

    informalOf a change, significant.

  3. 3

    Involving quanta, quantum mechanics or other aspects of quantum physics.

  4. 4

    Relating to a quantum computer.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

Quantum in Spanish, French, German and Portuguese

LanguageWords
Frenchquantité (quantity), quantum (indivisible unit of a given quantity), quantique (involving quanta)
GermanQuantum, Menge (quantity), Quant, Minimum (indivisible unit of a given quantity), Quanten- (involving quanta)
Portuguesequantidade (quantity), quantum (indivisible unit of a given quantity), quântico (involving quanta)
Spanishcantidad, quantum, quántum (quantity), cuanto (indivisible unit of a given quantity), cuántico, quántico (involving quanta)

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.

Where does quantum come from?

From Late Latin quantum, noun use of neuter form of Latin quantus (“how much”).

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What to look up after quantum