interstice
/ɪnˈtɜː.stɪs/noun
University
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
A fragment of space.
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.