Lembrança translates to "remembrance" or "memory". While not extremely rare, it's a beautiful and evocative word that carries more weight than a simple "memória" (memory).
In the context of "Não Se Esqueça de Mim" (Don't Forget Me), the singer repeatedly pleads for their love to remain in the other person's lembrança, even if a new love exists. It emphasizes the enduring nature of their past connection and the hope that it will not be completely erased, making it a poignant and central theme of the song.
Raquel Tavares sings this as one long request, repeated until it stops sounding like a request: 'Onde você estiver, não se esqueça de mim' ('Wherever you are, don't forget me'), sung to someone who has already left. She asks for something small — 'Eu quero apenas estar no seu pensamento' ('I just want to be in your thoughts'), a moment where 'você pensa em mim' ('you think of me').
She even makes room for whoever comes after her: 'Mesmo que exista outro amor que te faça feliz' ('Even if there's another love that makes you happy'), asking only that 'um pouco do muito que eu te quis' ('a little of how much I loved you') stays somewhere in his memory. What she admits she can't do is forget him first: 'Eu não consigo apagar você da minha vida' ('I can't erase you from my life'). The song ends on the title line, repeated so many times it stops being a plea and just becomes a fact.