materialization

The act of materializing or of investing with or assuming a material form; change from a spiritual, ideal, or imaginary state to a state of matter; specifically, among spiritualists, the alleged assumption by a spirit of a material or bodily form. Also spelled materialisation.

The act of materializing, or the state of being materialized.

The conversion of something into a physical form.

The conversion of energy into mass.

An appearance in bodily form (as of a disembodied spirit).