Institution
This building has a roof and will teach you about the origin of many things. It's an institution!
Institutions are places of learning, but they have to be a physical place with a roof and all that. If you're learning out in a field somewhere, that's probably not a proper institution.
いん
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What does institution start with? In (いん)!
Just remember, it's an IN-stitution, and you'll know this reading easy-peasy.