What is "kenoma"

Valentinius, a mid-2nd century Gnostic thinker and preacher, was among the early Christians who attempted to align Christianity with middle Platonism. Valentinius pooled dual concepts from the Platonic world of ideal forms, or fullness ( pleroma), and the lower world of phenomena, or emptiness (kenoma, κένωμα). Employing a third concept of cosmos, what is manifest, Valentinian initiates could exegete scripture in light of these three aspects of correlated existence.