Definitions from Wiktionary (double factorial)

▸ noun:  (mathematics, combinatorics) For an odd integer, the result of multiplying all the odd integers from 1 to the given number; or for an even integer, the result of multiplying all the even integers from 2 to the given number; symbolised by a double exclamation mark (!!). For example, 9!! = 1 × 3 × 5 × 7 × 9 = 945.



▸ Words similar to double factorial
▸ Usage examples for double factorial

▸ Idioms related to double factorial
▸ Wikipedia articles (New!)
▸ Words that often appear near double factorial
▸ Rhymes of double factorial

▸ Invented words related to double factorial