This is the 358th most frequent Finnish word.
voimassa
"In force" or "valid."
Here, "voimassa" indicates something (an offer) is currently active or valid.
Tarjous on voimassa vain tämän viikon.
The offer is valid only this week.
"Voimassa" here describes the state of the law being in effect or enforced.
Laki tulee voimaan ensi vuonna ja pysyy voimassa toistaiseksi.
The law will take effect next year and remain valid indefinitely.
Here, 'voimassa' points to the agreement being in effect during the specified duration.