UM
Etymology 1
Interjection
um
Expression of hesitation, uncertainty or space filler in conversation. See uh.
(chiefly, American) Dated spelling of mmm.
Verb
um (third-person singular simple present ums, present participle umming, simple past and past participle ummed)
(intransitive) To make the um sound to express uncertainty or hesitancy.
Etymology 2
Preposition
um
Alternative form of umbe
Etymology 3
A Latin-script rendering of µm.
Noun
um (plural um)
Alternative spelling of µm
Etymology 4
Particle
um
(dated, sometimes, humorous, often, offensive) An undifferentiated determiner or article; a miscellaneous linking word, or filler with nonspecific meaning; representation of broken English stereotypically or comically attributed to Native Americans.
Anagrams
• -mu-, MU, Mu, mu
Proper noun
UM
Initialism of University of Miami.
Initialism of University of Michigan.
Noun
UM (plural UMs)
(philately) Initialism of unmounted mint.
Anagrams
• -mu-, MU, Mu, mu
Source: Wiktionary