DECEMBER 31

 Dictionary entry overview: What does December 31 mean? 

• DECEMBER 31 (noun)
  The noun DECEMBER 31 has 1 sense:

1. the last day of the year

  Familiarity information: DECEMBER 31 used as a noun is very rare.

 Dictionary entry details 

• DECEMBER 31 (noun)

Sense 1

Meaning:

The last day of the year

Classified under:

Nouns denoting time and temporal relations

Synonyms:

December 31; New Year's Eve

Hypernyms ("December 31" is a kind of...):

day (a day assigned to a particular purpose or observance)

Hyponyms (each of the following is a kind of "December 31"):

Hogmanay (New Year's Eve in Scotland)

Holonyms ("December 31" is a part of...):

Dec; December (the last (12th) month of the year)

 Context examples 

NOTE(S): As an attribute with data type EXPRIVLTS.DATETIME, focalDateRange can be used to express a simple date range such as January 1, 1990 to December 31, 1999 or a relative time expression that includes a variable that represents another date in the model that is a study-defined anchor point.

(Defined Observation Focal Date Range, NCI Thesaurus/BRIDG)

, the focalDateRange would be January 1, 1990 to December 31, 1999.For the question, Have you smoked in the last 2 months, the focalDateRange would be an expression referencing a variable that represents the PerformedObservation.actualDateRange (a value yet to be defined) and a formula for the date range between when the question is asked (PerformedObservation.actualDateRange.low) and 2 months prior (PerformedObservation.actualDateRange.low - 2 months).

(Defined Observation Focal Date Range, NCI Thesaurus/BRIDG)