Meanings
nountriangular number (plural triangular numbers)
plural triangular numbers
- mathematicsAny integer that is the sum of n natural numbers from 1 to n.
Ten is a triangular number being the sum of 1, 2, 3, and 4.
Synonyms: triangle number, termial
Synonyms & antonyms
nounAny integer that is the sum of n natural numbers from 1 to n.
Similar
triangle numbertermial
Translations
Chinese Mandarin 三角形數 /三角形数
- 三角形數 /三角形数 (sānjiǎoxíngshù)an integer which is the sum of n natural numbers
Dutch driehoeksgetal
- driehoeksgetalan integer which is the sum of n natural numbers
Esperanto triangula nombro
- triangula nombroan integer which is the sum of n natural numbers
Finnish kolmioluku
- kolmiolukuan integer which is the sum of n natural numbers
German Dreieckszahl
- Dreieckszahlan integer which is the sum of n natural numbers
Hungarian háromszögszám
- háromszögszáman integer which is the sum of n natural numbers
Italian numero triangolare
- numero triangolarean integer which is the sum of n natural numbers
Japanese 三角数
- 三角数 (sankaku-sū)an integer which is the sum of n natural numbers
Latin numerus triangularis
- numerus triangularisan integer which is the sum of n natural numbers
Polish liczba trójkątna
- liczba trójkątnaan integer which is the sum of n natural numbers
Russian треуго́льное число́
- треуго́льное число́ (treugólʹnoje čisló)an integer which is the sum of n natural numbers
Spanish número triangular
- número triangularan integer which is the sum of n natural numbers
Tagalog bilang na tatsihain
- bilang na tatsihainan integer which is the sum of n natural numbers
Cite this entry
APA
triangular number. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/triangular%20number
MLA
“triangular number.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/triangular%20number. Accessed November 2, 2026.
Chicago
WatkinsX Dictionary, s.v. “triangular number,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/triangular%20number.
Source: triangular number on Wiktionary, CC BY-SA 4.0.