- (noun form very rare): a small opening or space between objects, especially adjacent objects or objects set closely together, as between cords in a rope or components of a multiconductor electrical cable or between atoms in a crystal. "The part that is not there."
- 1999 That he ran the risk of blowing out the stained-glass windows was of no consequence since no one liked them anyway, and the paper mill fumes were gnawing at the interstitial lead. - Neal Stephenson, Cryptonomicon.
- an interval of time required by the Roman Catholic Church between the attainment of different degrees of an order.
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Full Definition of interstice