[ roun-ding ]
See synonyms for rounding on
  1. round or nearly round.

  2. of, relating to, or used for making something round.

  1. turning, curving, or circling around.

  2. pertaining to the mathematical process of rounding: a rounding error.

  1. the act or process of making something round.

  2. Mathematics.

    • the process of replacing a number by another number of approximately the same value but having fewer digits: To the nearest dollar, the rounding of $27.68 yields $28.

    • a similar process that specifies one of various rules. Generally, the number is first truncated to one or two digits more than is desired; then the last one or two digits are adjusted in a specified way in order to reflect the magnitude of the original number. In rounding the final digits, 0–4 are simply dropped, 6–9 are dropped after the preceding digit is increased by 1, and 5 is handled in various ways depending on the surrounding digits and the particular convention being followed.: Compare truncate (def. 2).

Origin of rounding

First recorded in 1545–55; round1 + -ing2, -ing1

Words Nearby rounding Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use rounding in a sentence

British Dictionary definitions for rounding


/ (ˈraʊndɪŋ) /

  1. computing a process in which a number is approximated as the closest number that can be expressed using the number of bits or digits available

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012