Definition of significant digits in English English dictionary
The digits of the decimal form of a number beginning with the leftmost nonzero digit and extending to the right to include all digits warranted by the accuracy of measuring devices used to obtain the numbers. Also called significant figures
any digit of a number that is known with certainty; any digit of a number beginning with the leftmost non-zero digit and ending with the rightmost non-zero digit (or a zero considered to be the exact value); "he calculated the answer to four significantfigures
(Computers) digit that has the highest value within a group of digits (according to which one can discover if the digit is written from left to right or vice-versa)