noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The idea that what is true about the universe is the exact opposite of what a person or group of people believes. uncountable, usually
2. 2
   An act of reversing or a state of being reversed. countable, rare, usually

Etymology

From reversal + -ism.

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