WordReference Random House Unabridged Dictionary of American English © 2020
significant digits, [Math.]
  1. Mathematicsall the nonzero digits of a number and the zeros that are included between them or that are final zeros and signify accuracy:The significant digits of 0.01230 are 1, 2, 3, and the final 0, which signifies accuracy to five places.Also called  significant figures. 
  • 1920–25

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