“Xmas” is not originally an attempt to exclude Christ from Christmas, but uses an abbreviation of the Greek spelling of the word “Christ” with the X representing the Greek letter chi. However, so few people know this that it is probably better not to use this popular abbreviation in religious contexts.
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On the podcast this week, we repeat some old favorite episodes on the solstice and Christmas. Look for them Wednesday the 21st (Solstice) and Thursday the 22nd (Christmas).