This is the 55th most frequent Finnish word.
kertaa
"Kertaa" means "repeats" or "reviews."
The word "kertaa" here means "times" as a quantifier for how many iterations something is done.
Luen kirjan vielä kaksi kertaa.
I will read the book two more times.
The word "kertaa" here again signifies "times" as a measure of frequency.
Kuinka monta kertaa olet käynyt Suomessa?
How many times have you visited Finland?
The word "kertasi" (from the root "kertaa") here means "revised" or "went over again."