continuance (n.)

• addendum
• afterthought
• age
• antiquity
• appendix
• ceaselessness
• chorus
• coda
• codicil
• colophon
• conclusion
• consequence
• constancy
• continuation
• durability
• duration
• endlessness
• endurance
• envoi
• epilogue
• eternity
• everlastingness
• everness
• follow-through
• follow-up
• immutability
• incessancy
• indestructibility
• infinity
• lastingness
• longevity
• maintenance
• perdurability
• perennation
• permanence
• peroration
• perpetuity
• persistence
• postfix
• postlude
• postscript
• refrain
• run
• sempiternity
• sequel
• sequela
• sequitur
• stability
• standing
• steadfastness
• subscript
• suffix
• supplement
• survival
• tag
• timelessness