Akademik

permanency
noun
the property of being able to exist for an indefinite duration
Syn: ↑permanence
Ant: ↑impermanence (for: ↑permanence)
Derivationally related forms: ↑permanent, ↑permanent (for: ↑permanence)
Hypernyms: ↑duration, ↑length
Hyponyms:
perpetuity, ↑sempiternity, ↑lastingness, ↑durability, ↑enduringness, ↑strength, ↑imperishability, ↑imperishableness, ↑imperishingness, ↑perdurability, ↑immortality
Attrubites: ↑permanent, ↑lasting, ↑impermanent, ↑temporary

Useful english dictionary. 2012.