UMM (União Metalo-Mecânica, pron. ) is a Portuguese metal works factory and a former automobile manufacturer based in Lisbon. It was founded in 1977 with the purpose of manufacturing 4wd vehicles for agricultural, industrial and utility applications.

A syllable used to hold one's space in the conversation when actual words are not readily flowing, as in: "What does Odysseus want?""Umm..." But be careful, because it can become inadvertent euphemism for You Know What, as in "they obviously haven't 'ummed' yet."

Unresectable Malignant Mesothelioma

mother of, as Umm Ramses

Arabic—mother of.

A sound children utter when listening to a story, indicative of their interest.