semifactorial
semifactorial noun: synonym of double factorial.
Noun
semifactorial (plural semifactorials)
- Synonym of double factorial.
- With the symbol n#33;#33; we indicate the semifactorial of n, that is the product 1.3.5#92;dotsn if n is odd, and the product 2.4.6#92;dotsn if n is even.1942 February, Giulio Racah, “Theory of Complex Spectra. I”, in Physical Review, volume 61, numbers 3–4, →DOI, page 188
- In the formulas above we use the Euler beta function, a Jacobi polynomial evaluated at three, and also the familiar double factorial (also known as the semifactorial) notation defined by n#33;#33;#61;#92;begin#123;cases#125;#92;displaystyle 1#92;times 3#92;times...1994 January, Alan Edelman, Eric Kostlan, Michael Shub, “How many eigenvalues of a random matrix are real?”, in Journal of the American Mathematical Society, volume 7, number 1, →DOI, pages 250–251
- Synonyms:
- double factorial
Synonyms of semifactorial
Forms of semifactorial
| plural | semifactorials |
|---|
Origin of semifactorial
From semi- + factorial.
Questions about semifactorial
- What does semifactorial mean?
- Semifactorial means synonym of double factorial.
- What part of speech is semifactorial?
- Semifactorial is a noun.
- What is the plural of semifactorial?
- The plural of semifactorial is semifactorials.
Words near semifactorial in the dictionary
Source and license
Adapted from Wiktionary: semifactorial (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.
Last updated:
Cite this entry: “semifactorial.” Word.ws, https://word.ws/semifactorial. Based on Wiktionary, CC BY-SA 4.0.