One of the mysteries of the English language finally explained.
1‘she was a nurse at one time’
formerly, previously, once, in the past, at one point, at some point, once upon a time, time was when, in days gone by, in times gone by, in times past, in the old days, in the good old days, back in the day, long ago
literary in days of yore, in times of yore, of yore
archaic sometime, erst, erstwhile, whilom
2‘several matches were going on at one time’
simultaneously, at once, at the same time, at one and the same time, at the same instant, at the same moment, concurrently, concomitantly
together, all together, alongside each other, in unison, in concert, in chorus, as a group
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