significant figures , (esp. U.S.) significant digits
1 the figures of a number that express a magnitude to a specified degree of accuracy, rounding up or down the final figure
3.14159 to four significant figures is 3.142
2 the number of such figures
3.142 has four significant figures Compare →
decimal place →
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"