perpetuity (n.)
- age
- antiquity
- boundlessness
- ceaselessness
- chattering
- constancy
- continuance
- continuity
- countlessness
- distance
- durability
- duration
- endlessness
- endurance
- eternity
- extension
- extent
- forever
- immensity
- incessancy
- incomprehensibility
- infiniteness
- infinitude
- infinity
- lastingness
- length
- lengthiness
- limitlessness
- longevity
- longitude
- longness
- maintenance
- measure
- mileage
- oscillation
- perdurability
- perennation
- permanence
- persistence
- pulsation
- rapidity
- reach
- regularity
- repetition
- span
- stability
- standing
- steadfastness
- steadiness
- stretch
- survival
- sustainment
- tattoo
- timelessness
- universality
- vibration
- yardage
