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The place that serves as a base for superman. It was first seen in superman #17 on the borders of metropolis, however it is now usually thought to be located in antartica.
Superman keeps all his discoveries, artifacts, and inventions in his fortress of solitude.
by Abdallah February 03, 2006
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1. The place that serves as a base for superman. It was first seen in superman #17 on the borders of metropolis, however it is now usually thought to be located in antartica.

2. The bathroom at work, in it's solitude, you can have a few minutes of peace and quiet.
by ratpak5 March 07, 2011
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The wall of blankets you put around you on your twin size bed that you have against a wall that makes you feel warm and safe for once in your life
dude, I walked into Jeremy's room and thought someone was sleeping with him but it was just his (Fortress of solitude). Could imagine someone with him on that tiny ass twin?
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