Definitions

1. noun

the practice or prejudice of favouring the second letter ‘b’ in the word ‘déjà vu’ over the first letter ‘d’, or more generally, a preference for the second option in a pair of words starting with ‘di-‘ or ‘do-‘

“The phenomenon of betacism can be seen in many people’s preference for ‘deja vu’ over ‘déjà vu’.”