What does "y-day" mean?

1 March 1946, the planned date for the Allied invasion of the Kantō Plain to conquer Tokyo in World War II (cancelled following Japan's unconditional surrender in September 1945).

Y-day

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1
1 March 1946, the planned date for the Allied invasion of the Kantō Plain to conquer Tokyo in World War II (cancelled following Japan's unconditional surrender in September 1945). historical

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.