Collins Concise English Dictionary © HarperCollins Publishers::
significant figures, esp US significant digits pl n
  1. the figures of a number that express a magnitude to a specified degree of accuracy, rounding up or down the final figure: 3.141 59 to four significant figures is 3.142
  2. the number of such figures: 3.142 has four significant figures
'significant figures' also found in these entries (note: many are not synonyms or translations):
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