From Japanese-English FreeDict Dictionary ver. 0.1:
院 /(en)tʃˈaɪniːz(ja)lˈe̞tə/, いん /ˈiɴ/
1. (noun (common) (futsuumeishi))
下院・かいんhouse of parliament (congress, diet, etc.)
2. graduate school, postgraduate school
3. (suffix)
医院・いいん, 病院・びょういんinstitution (often medical), institutional building, government office
4. [Buddhist term] sub-temple, minor temple building, temple, cloister
5. (noun (common) (futsuumeishi))
Note: honorific or respectful (sonkeigo) languageimperial palace
6. 女院・にょういん
Note: honorific or respectful (sonkeigo) language
Note: archaismtitle bestowed on empresses, princesses, etc.
7. (suffix)
former (esp. of emperors, daimyos, etc.), late