On a single occasion

This time we are looking on the crossword clue for: On a single occasion.
it’s A 20 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: ONCE.

Last seen on: –Newsday.com Crossword – May 11 2020
USA Today Crossword – Feb 13 2020
Irish Times Simplex – Jan 2 2019
Daily Celebrity Crossword – 5/25/18 Sports Fan Friday
-Irish Times Simplex Crossword – Nov 28 2017