A non-zero quantity whose magnitude is smaller than any positive number (by definition it is not a real number).
Incalculably, exceedingly, or immeasurably minute; vanishingly small. Example: Do you ever get the feeling that you are but an infinitesimal speck, swallowed by the vastness of the universe and beyond?
Of or pertaining to values that approach zero as a limit.
Very small.
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