That Socrates accepted (or at least did not reject) Empedocles' claim can be seen in the Timaeus. However, he applied it also to cover the presence of form in matter. The form was an active principle. Matter, on the other hand is passive, being a mere possibility that the forms bring to life.
Aristotle clearly accepted Empedocles' claim , but he rejected Socrates' idea of the forms. According to Aristotle, the accidents of a substance are incorporeal beings which are present in it. "By being 'present in a subject' I do not mean present as parts are present in a whole, but being incapable of existence apart from the said subject." (The Categories 1a 24-26)
A closely related term is participation. If an attribute inheres in a subject, then the subject is said to participate in the attribute. For example, if the attribute in Athens inheres in Socrates, then Socrates is said to participate in the attribute, in Athens.