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Webster 1913 Edition
Interstition
Inˊter-sti′tion
,Noun.
 An intervening period of time; interval. 
[Obs.] 
Gower.
 Definition 2025
interstition
interstition
English
Noun
interstition (plural interstitions)
-  (obsolete) An intervening period of time; interval.
- Gower.