noun, adverb
after retirement; after resigning
Refers to the period or state following leaving a job, whether by retirement or resignation. Often used as a temporal noun or adverbially.
退職後の生活を楽しみにしている。
I'm looking forward to life after retirement.
退職後、彼は田舎に引っ越した。
After retiring, he moved to the countryside.
定年後 means 'after reaching mandatory retirement age,' while 退職後 is broader and includes voluntary resignation at any age.
Compound of 退職 (retirement/resignation) + 後 (after). The reading is the standard on'yomi combination.