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Wiktionary
round down

vb. (context transitive arithmetic English) To round (a number) to the greatest integer that is not greater than it, or to some other lower value, especially a whole number of hundreds, thousands, etc.

WordNet
round down

v. express as a round number; "round off the amount" [syn: round off, round out, round]

Usage examples of "round down".

The decision to round down to two decimal places reflects a decision that the accuracy of a third decimal place is excessive.