This is the 190th most frequent Latvian word.
dienā
"In a day" or "per day."
In this sentence, 'dienā' refers to 'in the afternoon,' a specific time within the day.
Saule spīdēja visu dienu un kļuva īpaši silts pēcpusdienā.
The sun shone all day, and it became especially warm in the afternoon.
Here, 'dienā' is part of the word 'brīvdienā,' referring to 'on a day off' (holiday).
Teiksimies tikties brīvdienā, kad mums būs brīvs laiks.
Let's arrange to meet on a day off when we are free.
Here, 'dienā' is used to mean 'in a day' or 'per day,' indicating the time span.