The clue "What macOS is based on" last appeared in the Newsday.com crossword on June 2, 2018. The correct answer for this puzzle is "UNIX", a 4-letter word.
Solution UNIX is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is UNIX with 4 letters, and the shortest is UNIX with 4 letters.
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The solution is 4 letters long.