P‑day
\ ˈpē‑ˌdā \ /ˈpiː ˌdeɪ/ also Pday, P Day · short for preparation day
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noun
Among the full-time missionaries of The Church of Jesus Christ of
Latter-day Saints: the one day each week set aside for laundry,
shopping, sightseeing, and writing a letter home. Usually Monday.
“We’ll hear from our missionary again on his next P‑day.”
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adjective
of or belonging to that day.
“Her P‑day letter came in this morning.”
Pday Letters