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Of moment or consequence; very important; weighty; as, a momentous decision; momentous affairs. -- Mo*men"tous*ly, adv. -- Mo*men"tous*ness, n.

Not momentous; unimportant; insignificant. [R.] A. Seward.

resulting from various conditions. He [Chesterfield] had recently governed Ireland, at a momentous conjuncture, with eminent firmness, wisdom, and humanity. Macaulay.

Of importance; momentous; weighty; influential; sedate; serious; - - said of character, relations, etc.; as, grave deportment, character, influence, etc. Most potent, grave, and reverend seigniors. Shak. A grave and prudent law, full of moral equity. Milton.

Important; momentous.

Important; momentous; forcible. "Your more ponderous and settled project." Shak.

Deserving to be considered; important; momentous; as, a significant event. Significant figures (Arith.), the figures which remain to any number, or decimal fraction, after the ciphers at the right or left are canceled. Thus, the significant figures of 25,000, or of .0025, are 25.

Adapted to turn the balance in the mind, or to convince; important; forcible; serious; momentous. "For sundry weighty reasons." Shak. Let me have your advice in a weighty affair. Swift.