Usually means: Floor Space Index in architecture.
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We found 7 dictionaries that define the word fsi:

General (3 matching dictionaries)
  1. FSi, fsi: Wordnik
  2. FSI: Dictionary.com
  3. FSI: Wikipedia, the Free Encyclopedia

Business (1 matching dictionary)
  1. Glossary of Trade and Shipping Terms (No longer online)

Miscellaneous (2 matching dictionaries)
  1. FSI: Acronym Finder
  2. AbbreviationZ (No longer online)

Slang (1 matching dictionary)
  1. FSi: Urban Dictionary

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