Definition of "disfluency"

To the long list of everyday afflictions that includes dry, itchy skin and restless leg syndrome, add another: speech disfluency.

2007 August 24, William Grimes, “Uh, Lead My Rips: No More Bloopers”, in New York Times‎

Siegel considered at some length, without resolving it, the apparent paradox between traditional views of stuttering and modern demonstrations that punishment (i.e. contingent aversive stimulation) tends to decrease disfluency.

2012, Donald K. Routh, Judy Lynne Perlman, “The Clinical Uses of Punishment: Bane or Boon?”, in Donald K. Routh, editor, Learning, Speech, and the Complex Effects of Punishment, page 198

Disfluency is a relatively recent construct. Not until the last century did fluency with the specific meaning of ease of speaking become a subject of widespread interest; and only in the mid-twentieth century did its corollary, the absence of such a facility, become the focus of systematic empirical study.

2022, Simon Williams, Disfluency and Proficiency in Second Language Speech Production, Springer Nature, page 1