1. to talk about something without referring to notes, documents, or other written material; to rely on one's recollection
She spoke from memory about her childhood experiences.
Ela falou de memória sobre suas experiências de infância.
2. to speak without preparation or forethought; to speak extemporaneously
The professor spoke from memory during the lecture, impressing the students.
O professor falou de memória durante a aula, impressionando os alunos.