Definition of Double factorial

1. 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. ¹

¹ Source: wiktionary.com

Lexicographical Neighbors of Double Factorial

double dog dare
double door
double doors
double double
double down
double dozen
double dribble
double dye
double eagle
double eagles
double emulsion
double entendre
double entendres
double entry
double exposure
double factorial
double factorials
double fault
double feature
double features
double figures
double file
double first
double firsts
double flap amputation
double flat
double flats
double fracture
double glazing
double gold

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