This is the 9305th most frequent Polish word.
twojej
"Twojej" means "your" (singular, feminine, genitive form).
The word 'twojej' is the genitive feminine second-person singular possessive pronoun modifying the noun 'książki' which is in the genitive case.
Twojej książki nie ma na stole.
Your book is not on the table.
The word 'twojej' is the locative feminine second-person singular possessive pronoun modifying the noun 'torbie' which is in the locative case.
Znalazłam zdjęcie w twojej torbie.
I found the photo in your bag.
The word 'twojej' is the genitive feminine second-person singular possessive pronoun modifying the noun 'sukienki' which is in the genitive case.