Speech disfluency (or speech dysfluency) is a term used to indicate breaks or irregularities during normal speech. Disfluencies are interruptions in the regular flow of speech pausing silently, repeating words, or interrupting oneself to correct something said previously.

These include :

• false starts - words and sentences that are cut off mid-utterance; phrases that are restarted or repeated, and repeated syllables.
• fillers - grunts, and non-lexical or semiarticulate utterances such as huh, uh, erm, um, and hmm, and phrases like well, so, I mean, and like.
• silent pauses - brief periods where nothing is said.
• repaired utterances - instances of speakers correcting their own slips of the tongue or mispronunciations (before anyone else gets a chance to).

This is different from stammering and stuttering.

How We Talk by N.J. Enfield that explores some of these ideas as part of conversation analysis.