co·e·ter·ni·ty 
(kō′ĭ-tûrnĭ-tē)
(kō′ĭ-tûrnĭ-tē)n.
Existence for eternity with another or others.
- special theory of relativity
- specialty
- speciate
- speciation
- speciational
- specie
- species
- speciesism
- speciesist
- species-specific
- species-specificity
- specifiable
- specific
- specifically
- specification
- specific epithet
- specific gravity
- specific heat
- specific humidity
- specific impulse
- specificity
- specific performance
- specific resistance
- specific thrust
- specifier