[ hahy-per-ur-buh-niz-uh m ]
/ ˌhaɪ pərˈɜr bəˌnɪz əm /

noun Linguistics.

a pronunciation or grammatical form or usage produced by a speaker of one dialect according to an analogical rule formed by comparison of the speaker's own usage with that of another, more prestigious, dialect and often applied in an inappropriate context, especially in an effort to avoid sounding countrified, rural, or provincial, as in the pronunciation of the word two (to̅o̅) as (tyo̅o̅).

Origin of hyperurbanism

First recorded in 1920–25; hyper- + urban + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019