It is IRS speak for leaving your employment.
If the employee separates from service during or after the year the
employee reaches age 55 (age 50 for public safety employees of a state,
or political subdivision of a state, in a governmental defined benefit
plan) the 10% early distribution penalty does not apply.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**