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1.
A person who celebrates the holidays of one or more religion, but observes no other religious traditions.
"Steve celebrates Christmas, Easter and Hanukkah, but doesn't do anything else religious. He is a total holideist."

"It's great being a holideist. You celebrate all of the holidays you want, and do none of the lame stuff like fasting or going to church/temple/mosque/etc."
by Buruschi December 18, 2008