The term 'DEEP Spaces' can be broken down into two words, 'DEEP' and 'Spaces'. The first word, 'DEEP', is defined as having a great depth or extent, while the second word, 'Spaces', refers to an area or expanse that is free, available, or unoccupied. When combined, the term 'DEEP Spaces' can refer to areas of great depth or extent that are free, available, or unoccupied. The crossword solution for this term is 'ABYSSES', which is defined as a DEEP or seemingly bottomless chasm, gulf, or cavity. Therefore, the term 'DEEP Spaces' can be used to describe a DEEP or seemingly bottomless chasm, gulf, or cavity.