at one time meaning

Adverb: at one time

1. Simultaneously
   - at a time, at once 
2. At a previous time
   "at one time he loved her"
   - once, formerly, erstwhile [archaic], erst [archaic], sometime [archaic]

[American slang]
adv. phr. 1. In the same moment; together. Let's start the dance again all at one time. Mr. Reed's bills came all at one time and he could not pay them.
Synonym: AT THE SAME TIME¹. 2. At a certain time in the past; years ago. At one time people thought that Minnesota was not a good place to live. At one time most school teachers were men, but today there are more women than men.

Examples

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1. at one time i used to go skiing every winter.
2. the city at one time must have been prosperous.
3. the song had a great vogue at one time.
4. i cared for her very much at one time.
5. my brain can not hold so much information at one time.