Learn Portuguese (Portugal): O perfume cheira a rosa. Aliás, é muito floral. - The perfume smells like rose. In fact, it is very floral.

Here, aliás is used for emphatic addition. It translates to "in fact" or "moreover." It builds on the first statement about smelling like rose by adding a stronger or broader related point (being very floral). It doesn't correct the previous sentence; it reinforces it.

Could aliás mean "by the way" in this context?

While aliás can sometimes mean "by the way" when introducing a related side note, it doesn't fit perfectly here. In this sentence, the second part directly intensifies the first part, making "in fact" or "actually" the most natural interpretation.

Why do we need the preposition a after cheira?

When you want to say that something smells like or of something else, the verb cheirar requires the preposition a. Without it, o perfume cheira would just mean "the perfume smells" (either generally giving off an odor, or smelling bad).

Why is rosa in the singular here instead of plural (rosas)?

When talking about scents, flavors, or essences, Portuguese typically uses the singular noun. It refers to the general essence of "rose" rather than physical individual flowers. You will see the same pattern with flavors, like gelado de morango (strawberry ice cream).