Is Supercalifragilisticexpialidocious a real word?

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Tags

1. #something
2. #nonsensical
3. #brought
4. #audiences
5. #obnoxious
6. #supercalifragilisticexpialidocious
7. #atrocious
8. #syllables
9. #decades
10. #mouthful
11. #british
12. #poppins
13. #certainly
14. #cheer
15. #simply
16. #nothing