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At any one time vs At any time

at any one timeon each separate occasion:

  • These were what were known as “bottle shops,” and could not sell less than a bottle of spirits at any one time.

at any time

1. at any given moment:

  • The navigational system enabled our bombers to know exactly where they were at any time en route to Germany.

2. at a time which may be very soon:

  • We may need the trucks at any time. I’ll phone if I want you to roll them.

3. at any time one chooses:

  • Anyone is welcome to join in at any time during the day.

4. no matter when; whenever:

  • If at any time you have questions, please feel free to call.

See also: at all hours / at any hour.