Meaning : In a manner acceptable to common custom.
Example :
You cannot do this legitimately!.
In a manner disapproved or not allowed by custom.
He acted illegitimately when he increased the rent fourfold.Meaning : In a lawfully recognized manner.
Example :
Let's get married so our child can be born legitimately.
Of biological parents not married to each other.
This child was born illegitimately.Legitimately meaning in Bengali (Bangla).