AT ONE TIME

Pronunciation (US):

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 Dictionary entry overview: What does at one time mean? 

• AT ONE TIME (adverb)
  The adverb AT ONE TIME has 2 senses:

1. simultaneously

2. at a previous time

  Familiarity information: AT ONE TIME used as an adverb is rare.

 Dictionary entry details 

• AT ONE TIME (adverb)

Sense 1

Meaning:

Simultaneously

Synonyms:

at a time; at once; at one time

Context example:

he took three cookies at a time

Sense 2

Meaning:

At a previous time

Synonyms:

at one time; erst; erstwhile; formerly; once

Context example:

she was a dancer once

 Context examples 

Yes, and they were the best of friends at one time.

(The Memoirs of Sherlock Holmes, by Sir Arthur Conan Doyle)

The largest amount of a substance or radiation that a person is exposed to at one time.

(Peak exposure, NCI Dictionary)

An amount of drug that is more than what should be taken at one time.

(Overdose, NCI Dictionary)

The Duke, his father, was at one time Secretary for Foreign Affairs.

(The Adventures of Sherlock Holmes, by Sir Arthur Conan Doyle)

I have lived in the same house with her, at one time for five and at another for nearly two years.

(Frankenstein, by Mary Wollstonecraft Shelley)

It was more money than he had ever possessed at one time.

(Martin Eden, by Jack London)

Nearly everyone has had indigestion at one time.

(Indigestion, NIH: National Institute of Diabetes and Digestive and Kidney Diseases)

A reduced quantity of a therapeutic agent prescribed to be taken at one time or at stated intervals.

(Low-Dose Treatment, NCI Thesaurus)

A laboratory tool used to analyze large numbers of genes or proteins at one time.

(Microarray, NCI Dictionary)

The amount of drug administered to a patient or test subject at one time or the total quantity administered. [AMA Manual of Style] (CDISC Glossary)

(Dose, NCI Thesaurus/CDISC)