1) Connection 2) Duration 3) Fixture feature 4) Lastingness 5) Length 6) Link 7) Obstinacy 8) Permanency 9) Quiescence 10) Stability 1) Constancy 2) Durability 3) Enduringness 4) Fixity 5) Foreverness 6) Immortality 7) Imperishability 8) Imperishingness 9) Lastingness 10) Perdurability 11) Permanency 12) Perpetuity 13) Perseverance 14) Sempiternity 15) Stability 16) Toughness 
Permanence is the state of being permanent: Popular culture: ...
• (n.) Alt. of Permanency
A paper's ability to resist tears, fading, and general aging over time. The national standard for permanence requires a pH of 7.5-8.5; at least 2% calcium carbonate; and no ground wood or unbleached fiber. The standard also has specific fold endurance and tear resistance requirements. Paper meeting the standard for permanence can be expected to las...
[n] - the property of being able to exist for an indefinite duration
permanency noun the property of being able to exist for an indefinite duration