noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The result of deranging a number. In equations, it is usually symbolised by an exclamation mark (!) before the number being deranged (as opposed to factorials, where the exclamation mark occurs after the number).

Etymology

From sub- + factorial.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.