(set phrase) At some unspecified time in the future. / At some unspecified time in the past. / Used other than figuratively or idiomatically: see one, day.

lasting one day

Synonym of in one's time

(cricket) A form of cricket, played on one day, in which each side bats only once. Each side's innings finishes when either their allotted number of overs has been completed, or all ten wickets have been lost.

(cricket) a one-day match played between teams representing the Test nations; a similar match in a tournament such as the World Cup

(cricket) a game of cricket played on one day; each side batting once

plural of one-day international

plural of one-day match

every day / on a given day

(idiomatic) Approach each situation with focus on the present rather than preoccupation about the future.