interstice

noun4

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.
2. •
   (figurative) 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
3. •
   An interval of time required by the Roman Catholic Church between the attainment of different degrees of an order.
4. •
   A small interval of time free to be spent on activities other than one's primary goal.