Meaning of “second” - Learner’s Dictionary

second

noun [ C ] us uk /ˈsekənd/
Extra Examples
He could only keep his head under the water for a few seconds.With the final seconds ticking away, Milan scored a goal.He thought for a few seconds before answering.He won by a hundredth of a second.It was all over in a split second.
TIME

A2 one of the 60 parts a minute is divided into

SHORT TIME informal

B1 a very short period of time:

I'll be back in just a second.
It only took a few seconds.
PRODUCT

something that is sold cheaply because it is damaged or not in perfect condition:

[ usually plural ] Some of those towels are seconds.

(Definition of “second noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)