Dictionary![]() ![]() por•ten•tousPronunciation: (pôr-ten'tus, pōr-), [key] —adj. 1. of the nature of a portent; momentous. 2. ominously significant or indicative: a portentous defeat. 3. marvelous; amazing; prodigious. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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