aukko

noun
  1. A gap, opening, or hole in a surface or between objects. noun
    The fence had an aukko large enough for the dog to escape.
    She peered through the aukko in the curtain to see who was outside.
  2. A missing part or section in a series or sequence. noun
    There was an aukko in the data that needed to be filled before the analysis could proceed.
    The manuscript had an aukko where a page had been torn out.