This word is acceptable for play in the UK dictionary that is being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The process of which an employee is removed from work registrant status.

"Askar AKAYEV 75\%; note - elections were held early which gave the two opposition candidates little time to campaign; AKAYEV may have orchestrated the "deregistration" of two other candidates, one of whom was a major rival"

preregistration    registration