This is the 436th most frequent Spanish word.
conocido
Known; acquaintance.
In this sentence, 'conocido' is used as an adjective to mean 'well-known' or 'famous', providing information about the actor.
Él es un famoso actor muy conocido en el mundo del cine.
He is a famous actor very well-known in the world of cinema.
Here, 'conocido' is used as a noun to mean 'acquaintance', referring to a person she knows.
Ella me presentó a su conocido durante la reunión.
She introduced me to her acquaintance during the meeting.
In this case, 'conocido' acts as an adjective meaning 'known to', describing the concept's familiarity among scientists.