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.
I'll call you from the fortress of solitude, in a few minutes.
by ratpak5 March 07, 2011
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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