We should not confuse intentional with intensional.
An entity is intentional if it is just a formal sign : Its whole being consists in intending some entity other than itself.
On the other hand, the meaning or signification of a concept can be interpreted either intensionally, or extensionally.
A meaning or signification is intensionally interpreted when we let the concept, which is a natural sign, point to a certain formal content.
A meaning or signification is extensionally interpreted when we indicate all the individuals to which the concept is applicable. That is we indicate the extension of the domain of relevance of the concept. Such a signification is also called denotation.