This is the 2008th most frequent German word.
interessierte
"Interessierte" means "interested persons" or "people who are interested."
Here, 'interessierte' is used as an adjective in its attributive form to describe a noun ('Student'). It conveys the meaning of being interested or engaged in something.
Der interessierte Student stellte viele Fragen.
The interested student asked many questions.
Here, 'interessierte' forms part of the reflexive verb 'sich interessieren'. It conveys the meaning of someone having an interest in specific subjects or topics.
Sie interessierte sich für Kunst und Geschichte.
She was interested in art and history.
Here, 'interessierte' is used as a past-tense verb in the active voice. It means that the subject (the lecture) caused interest in the audience.