This clue appeared in the NYT Crossword on Sunday, January 11, 2026 (72 Across). The answer is hidden below until you want it. Sunday puzzles are large (21 by 21) and themed, about as hard as a Wednesday or Thursday.
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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