Synonyms of 'jiffy'
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An instant is an extremely short period of time.
The pain disappeared in an instant.
You can refer to a very short period of time, for example a few seconds, as a moment or moments.
In a moment he was gone.
A second is one of the sixty parts that a minute is divided into. People often say 'a second' or 'seconds' when they simply mean a very short time.
For a few seconds nobody said anything.
Thesaurus for jiffy from the Collins English Thesaurus
a very short time