| dec | | |
| n. | 1. dec, december | the last (12th) month of the year. |
| ~ gregorian calendar, new style calendar | the solar calendar now in general use, introduced by Gregory XIII in 1582 to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752. |
| ~ december 31, new year's eve | the last day of the year. |
| ~ christmas day, dec 25, xmas, christmas | a Christian holiday celebrating the birth of Christ; a quarter day in England, Wales, and Ireland. |
| ~ christmas, christmastide, christmastime, noel, yule, yuletide | period extending from Dec. 24 to Jan. 6. |
| ~ gregorian calendar month | a month in the Gregorian calendar. |
| ~ mid-december | the middle part of December. |
| n. | 2. celestial latitude, dec, declination | (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere. |
| ~ astronomy, uranology | the branch of physics that studies celestial bodies and the universe as a whole. |
| ~ angular distance | the angular separation between two objects as perceived by an observer.; "he recorded angular distances between the stars" |
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