rightful

形容词 rightful:

1. legally valid
2. having a legally established claim
   同义词：true, lawful

1. He has a rightful claim to the property; it was his mother's.
   这份财产原是他母亲的，他具有合法所有权。
2. He was cheated (out) of his rightful inheritance.
   他依法应得的遗产被人骗走了。
3. I am the rightful owner of this car.
   我是这辆新车的合法主人。
4. What he said is a rightful claim.
   他所说的是正当的要求。

right.ful

adj.（形容词）
Right or proper; just.
正确的，正当的；公正的
Having a just or proper claim:
合法的：具有合法或正当要求的：
例句：
Return this dog to its rightful owner.
将这条狗归还其合法主人

Held or owned by just or proper claim:
依法享有权利的：以合法或正当的要求持有或拥有的：
例句：
This land is my rightful property.
这块地产是我合法拥有的财产

【引伸】
right.fully
adv.（副词）
right.fulness
n.（名词）