This is the 20th most frequent Finnish word.
aikana
"During" or "in the time of."
The word 'aikana' is used here to denote a time period within which an action will take place.
Minun täytyy työskennellä viikon aikana.
I have to work during the week.
In this example, 'aikana' is used to frame the time during which the learning process took place.
Kurssin aikana opimme monta uutta asiaa.
During the course, we learned many new things.
Here, 'aikana' specifies the occurrence of events within the timeframe of the war.