This is the 12283rd most frequent Swedish word.
sekund
"Sekund" in Swedish means "second," a unit of time.
Here, 'sekund' is used in an idiomatic sense, meaning a very short amount of time, not necessarily literally one second.
Jag återkommer inom en sekund.
I will get back to you in a second.
In this case, 'sekund' is used to denote the unit of time, a second.
En minut består av sextio sekunder.
A minute consists of sixty seconds.
The usage of 'sekund' here refers to a specific short duration, indicating how quickly something was accomplished.