rational number

noun

A number that can be expressed as the ratio of two integers.

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Meanings

nounrational number (plural rational numbers)

plural rational numbers

  1. mathematicsA number that can be expressed as the ratio of two integers.

Synonyms & antonyms

nounan integer or a fraction

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Also see

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Latinrationalis
  2. Englishrational number

From rational + number, ultimately from Latin rationalis + numerus. Compare analogous logarithm, from Ancient Greek.

Full word history & related roots →

Translations

Afrikaans rasionale getal
  • rasionale getalquotient of integers
Bengali মূলদ সংখ্যা
  • মূলদ সংখ্যা (mulod śoṅkha)quotient of integers
Bulgarian рациона́лно число́
  • рациона́лно число́ (racionálno čisló)quotient of integers
Catalan nombre racional
  • nombre racionalquotient of integers
Chinese Mandarin 有理數 /有理数
  • 有理數 /有理数 (yǒulǐshù)quotient of integers
Czech racionální číslo
  • racionální čísloquotient of integers
Danish rationelt tal
  • rationelt talquotient of integers
Dutch rationaal getal
  • rationaal getalquotient of integers
Esperanto racionala nombro
  • racionala nombroquotient of integers
Estonian ratsionaalarv
  • ratsionaalarvquotient of integers
Finnish rationaaliluku
  • rationaalilukuquotient of integers
French nombre rationnel
  • nombre rationnelquotient of integers
German rationale Zahl
  • rationale Zahlquotient of integers
Greek ρητός αριθμός
  • ρητός αριθμός (ritós arithmós)quotient of integers
Hindi परिमेय संख्या
  • परिमेय संख्या (parimey saṅkhyā)quotient of integers
Hungarian racionális szám
  • racionális számquotient of integers
Icelandic ræð tala
  • ræð talaquotient of integers
Italian numero razionale
  • numero razionalequotient of integers
Japanese 有理数
  • 有理数 (yūrisū)quotient of integers
Korean 유리수
  • 유리수 (yurisu)quotient of integers
Latin numerus rationalis
  • numerus rationalisquotient of integers
Māori tauwehe whakahau
  • tauwehe whakahauquotient of integers
Norwegian rasjonalt tall
  • rasjonalt tallquotient of integers
Polish liczba wymierna
  • liczba wymiernaquotient of integers
Portuguese número racional
  • número racionalquotient of integers
Romanian număr rațional
  • număr raționalquotient of integers
Russian рациона́льное число́
  • рациона́льное число́ (racionálʹnoje čisló)quotient of integers
Spanish número racional
  • número racionalquotient of integers
Swedish rationellt tal
  • rationellt talquotient of integers
Tagalog bilang na tagwayin
  • bilang na tagwayinquotient of integers
Thai จำนวนตรรกยะ
  • จำนวนตรรกยะ (jam-nuuan-dtàk-gà-yá)quotient of integers
Turkish rasyonel sayı
  • rasyonel sayıquotient of integers
Vietnamese số hữu tỉ
  • số hữu tỉquotient of integers
Cite this entry
APA

rational number. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/rational%20number

MLA

“rational number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/rational%20number. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “rational number,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/rational%20number.

Source: rational number on Wiktionary, CC BY-SA 4.0.