This is the 641st most frequent Czech word.
vaše
"Vaše" means "your" or "yours" (possessive, plural or formal singular) in English.
The word 'vaše' is the possessive pronoun for 'your' when addressing a group or showing politeness to one individual, used here to modify the noun 'knihy' (books).
Vaše knihy jsou na stole.
Your books are on the table.
'Vaše' is used as a possessive pronoun for 'your', inquiring about ownership of the noun 'pero' (pen).
Toto je vaše pero?
Is this your pen?
Here, 'vaše' indicates that the subject is referring to an object (car) belonging to the addressed person(s), showing possession.