Formal:
* Senhora: This is the most common and formal way to address a woman, similar to "Madam" in English.
Informal:
* Senhorita: This is used for unmarried women, similar to "Miss" in English.
* Mulher: This is the general word for "woman" and can be used in informal contexts.
* Dama: This is a more poetic and literary term for "lady."
It's important to consider the context and your relationship with the woman when choosing the appropriate word.