This clue appeared in the NYT Crossword on Monday, August 24, 2026 (30 Across). The answer is hidden below until you want it. Monday puzzles are the easiest of the week, so the clue is likely a plain definition.
Answer length: 4 squares
First letter
O _ _ _
First and last letters
O _ _ O
Show the answer
About the answer
ONTO as a word: (mathematics, of a function) Attaining each of the values in its codomain; having its image equal to its codomain.
ONTO has been an answer 9 times in the NYT Crossword and Mini since November 2, 2025.
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