Definition of um in English:

um

Line breaks: um
Pronunciation: /(ə)m
 
/

exclamation

Expressing hesitation or a pause in speech: anyway, um, where was I?

Origin

natural utterance: first recorded in English in the early 17th century.

Definition of um in:

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Pronunciation: fɪˌɔːrɪˈt(j)ʊərə
noun
an embellishment of a melody...