This is the 86th most frequent Latvian word.
jaunu
"Jaunu" means "new" in English (accusative form).
The word "jaunu" is used as an adjective in the accusative singular form, modifying the noun "grāmatu" (book) to describe its state as 'new'.
Es nopirku jaunu grāmatu.
I bought a new book.
The word "jaunu" functions as an adjective describing "ko" (something), indicating its quality as being 'new'.
Man vajag ko jaunu uzzināt.
I need to learn something new.
Here, the word "jaunu" is an adjective in the accusative singular form, modifying "plānu" (plan) to characterize it as 'new'.