SYN: Instant, second, importance, twinkling, trice, weight, force, gravity, consequence, avail.
ANT: Age, period, century, generation, triviality, insignificance, worthlessness, unimportance, inefficacy.
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KEY: Momentary.
SYN: Instantaneous, fleeting, transitory, [See INSTANT].
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KEY: Momentous.
SYN: Significant, important, material, weighty, [See IMPORTANT].
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KEY: Monad, [See MOLECULE].