Two decades ago we used entitled in sentences such as "This is from the book entitled . . ." Today the word titled is enough and means it's the name of a book or a play.
Entitled now carries a restricted use that means a right to have something or a claim: I worked harder than anyone else, so I am entitled to the biggest portion.
Entitled implies deserving or a right protected by law: As the older sibling, I'm entitled to (I deserve) more of the inheritance. Despite that, my father says I'll receive one-third. That is, one-third is my lawful portion.
English keeps changing,
and I grow with the changes.