interstice

Noun

interstice (plural interstices)

1. A small opening or space between objects, especially adjacent objects or objects set closely together, such as between cords in a rope, components of a multiconductor electrical cable or atoms in a crystal.
   • The tide leaves the sand, though apparently dry on the surface, with all its interstices perfectly full of water which is kept up to the surface of the sand by capillary attraction; at the same time the water is percolating through the sand from the sands above where the capillary action is not...1887, Osborne Reynolds, Experiments showing Dilatancy, in Notices of the Proceedings, Volume 11, Royal Institution of Great Britain, page 360

   Synonyms:

   chink

2. (figuratively) A fragment of space.
   • Relics of the British empire now mostly survive in the interstices of the global economy. They are the major winners from the fiscal haemorrhage that has resulted from financial globalisation.2013 August 14, Simon Jenkins, “Gibraltar and the Falklands deny the logic of history”, in The Guardian, archived from the original on 10 Aug 2014
3. An interval of time required by the Roman Catholic Church between the attainment of different degrees of an order.
4. (broadly) A small interval of time free to be spent on activities other than one's primary goal.