This is the 367th most frequent Lithuanian word.
jūsų
"Jūsų" means "your" or "yours" (formal or plural) in English.
Here, "jūsų" denotes possession and shows that the book belongs to the person or people being spoken to respectfully.
Ar tai yra jūsų knyga?
Is this your book?
In this instance, "jūsų" is used respectfully to address someone inquiring about their day.
Kaip praėjo jūsų diena?
How did your day go?
Here, "jūsų" refers to something related to the person or people being respectfully addressed.