Full Idea
Aristotle argues that non-primary beings either do not have an essence at all, or they have an essence only in a derived way.
Gist of Idea
Non-primary beings lack essence, or only have a derived essence
Source
report of Aristotle (Metaphysics [c.324 BCE], ousia) by Vassilis Politis - Aristotle and the Metaphysics 7.5
Book Reference
Politis,Vasilis: 'Aristotle and the Metaphysics' [Routledge 2004], p.215
A Reaction
While I presume that Aristotle takes 'being' to be a univocal concept, he nevertheless divides it into 'primary' (or independent) and 'non-primary' (or dependent) being. His main subject of study is the primary version.