I would not necessarily understand it to include Thanksgiving. I would take "holiday season" to mean approximately from December 10 through January 10 at the latest -- more narrowly, from December 24 through January 1. CJ
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khoffRetailers might consider the "holiday season" to begin at ThanksgivingOr Halloween. I know that the music that comes from the ceiling at Walgreen's Drug Stores here in California changes to Christmas music at midnight on Halloween. I have it on the authority of a pharmacist friend of mine who works the night shift there!