Definitions of CEI:
- noun: Initialism of Central European Initiative.
- noun: Initialism of Cycle Engineers' Institute, one of three screw thread standards contributing to the Whitworth threads standards set
- noun: (BDSM) Initialism of cum-eating instructions: written or recorded instructions directing a submissive to consume semen.
- noun: (uncommon) Initialism of child exploitation images.
(Definitions from Wiktionary)
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