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English definition of “interstitial”

interstitial

adjective (BETWEEN)    /ˌɪn.təˈstɪʃ.əl/ US  /ˌɪn.tərˈstɪʃ.əl/
formal relating to the space or time between things: the interstitial parts of the movie that punctuate the main action
(Definition of interstitial adjective (BETWEEN) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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