- noun the action of showing figures with fewer decimal places than they should have, to give a whole unit result. Normally figures below .5 are rounded down to the nearest whole figure below, and figures above .5 are rounded up.
- The dropping of one or more decimal digits from a number, with the rightmost remaining digit being increased if the next number was 5 or higher. For example, 0.44444 rounded to four decimal places would be 0.4444, while 0.66666 rounded to four decimal places would be 0.6667. When truncating, digits are simply dropped, with the rightmost remaining digit never changing.
- The smoothing of the corners of a rectangular wave or curve with sharp transitions. Seen, for instance, in the comer effect.