This is the 470th most frequent Latvian word.
domāju
"I think."
Here, 'domāju' is present tense of 'domāt' (to think) and means 'I think'.
Es domāju, ka tas ir labs plāns.
I think that it's a good plan.
In this case, 'domāju' is in the past tense meaning 'I thought'.
Es domāju par tevi vakar.
I thought about you yesterday.
Here, 'domāju' conveys thoughtfulness or contemplation, which might translate as 'I am wondering'.