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The phrase "a single calendar" is correct and usable in written English.
You can use it when referring to one specific calendar, often in contexts where multiple calendars are being discussed or compared.
Example: "To streamline our scheduling, we decided to consolidate all events into a single calendar."
Alternatives: "one calendar" or "a unified calendar".
Exact(60)
Crucially, all this usually happens in a single calendar day.
Dogs pack seven years of their lives into a single calendar year.
The fact that these movies were all released in a single calendar year is, of course, nothing more than coincidence.
That one man, named neither Nadal nor Federer, might lift all four Grand Slam titles in a single calendar year.
Most unexpected surprise (pleasant) The arrival of not one but two superb Chekhov productions in a single calendar year.
It is widely acknowledged that, to craft a tidier narrative, Thoreau condensed his twenty-six months at the cabin into a single calendar year.
People in the Western Hemisphere who look to the sky Friday night will witness a relatively rare lunar event: a second new moon in a single calendar month.
FALLING within days of one another this (Gregorian) year, the Han Chinese and Tibetan New Year's celebrations have almost shared a single calendar.
(B) No exporter, reexporter or transferor may send more than six shipments of any one toxin to any one end user in a single calendar year.
Cinemas are unlikely to welcome such a commercially strong set of titles in a single calendar year for some time, and the industry has a fight on its hands if 2016 has any hope of coming close to 2015.
The grand slam of golf – all four major titles in a single calendar year – has remained elusive, even to Jack Nicklaus and Tiger Woods, and Pete Sampras, Federer and Nadal have never matched Rod Laver's tennis grand slam of 1969.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com