1. The quality or state of being permanent; permanence.
Usage: Rare or archaic; 'permanence' is the standard modern term.
2. In physics and engineering, the magnetic permeability of a material; the ability of a substance to support the formation of a magnetic field within itself.
Usage: Technical; used in electromagnetism and materials science.

Examples

• The permeance of stone structures has made them symbols of lasting civilization.
• Engineers must consider the permeance of materials when designing electromagnetic devices.
• The permeance of their friendship was tested by years of separation.
• In magnetic circuit analysis, permeance is the reciprocal of reluctance.
• The artist sought to capture a sense of permeance in her monumental sculptures.