Newtonmas
noun ·Rare ·Advanced level
Definitions
- 1 December 25, Isaac Newton's birthday (in the Julian calendar). humorous
"At Christmas, 1890, or Newtonmas, 248, for the first time, the members of the Newtonkai, or Newton Association, met in the Physical Laboratory of the Imperial University, to hear each other talk, to distribute appropriate gifts, and to lengthen out the small hours with laughter and good cheer."
- 2 December 25 through January 4, Isaac Newton's birthday (in the Gregorian calendar). humorous
"Olivia Judson, an evolutionary biologist, recommends celebrate Newtonmas on December 25th and ten extra days representing the interval between Newton's birth dates on the Julian and Gregorian calendars."
Example
More examples"At Christmas, 1890, or Newtonmas, 248, for the first time, the members of the Newtonkai, or Newton Association, met in the Physical Laboratory of the Imperial University, to hear each other talk, to distribute appropriate gifts, and to lengthen out the small hours with laughter and good cheer."
Etymology
From Newton + -mas, after Isaac Newton.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.