To pass from a higher to a lower place; to move downwards; to come or go down in any way, as by falling, flowing, walking, etc.; to plunge; to fall; to incline downward.
Death is followed by either ascension into a higher plane or descension into a lower plane.
Descent; the act of descending. [from 15th c.] 
Consciousness Descension into Matter Biology
The Transduction Sequence describes the process by which consciousness undergoes several stages of Descension, passing through multiple layers of dimensionalization in order to manifest into a matter form. Consciousness uses a Blueprint, architecture to express itself in matter. A Core Manifestation Template is designed for consciousness to express itself into the biological form that is located within a specific dimension of time and space.