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Definition of Um
Um Om Om, interj. & n. [Also Aum, Um.] [Skr. [=o]m.]
A mystic syllable or ejaculation used by Hindus and Buddhists
in religious rites, -- orig. among the Hindus an exclamation
of assent, like Amen, then an invocation, and later a symbol
of the trinity formed by Vishnu, Siva, and Brahma.
Om mani padme hun, a sacred formula of buddhism (esp. of
the Lamaists) translated ``O, the Jewel in the Lotus,
Amen,' and referring to Amitabha, who is commonly
represented as standing or sitting within a lotus.