This is the 52nd most frequent Finnish word.
ajan
The Finnish word "ajan" means "time" in the genitive case ("of time") or "I drive" (conjugated form of the verb "ajaa" in the first person singular).
Here, 'ajan' is the first-person singular form of 'ajaa' in its present tense, meaning 'drive' or 'lead'.
Teen tämän työn ajan.
I will do this for the duration of the work.
'ajan' acts as a genitive form of the noun 'aika', denoting possession or association with time.
Opiskelen historiaa ajan kanssa.
I study history with time.
In this sentence, 'ajan' is used within the expression 'ajan myötä', meaning 'over time' or 'as time goes by'.