noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The arithmetic operation of repeated pentation. uncountable, usually

Etymology

From hexa- + (itera)tion. The word was coined by the English mathematician Reuben Goodstein (1912–1985).

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