Definition of unretirement in US English:

unretirement

noun

US
  • The action or fact of returning to work after having retired; an instance of this. Also: a period of time during which a person has returned to work after having retired.

Origin

1940s; earliest use found in The Chester Times. From un- + retirement.

Pronunciation

unretirement

/(ˌ)ʌnrɪˈtʌɪəm(ə)nt/