### Question
What does retirement system mean?


### Answer
**Retirement system** has the following meaning in *42 U.S.C. § 410*:

> given such term by section 418(b)(4) of this title;

#### Citation:
  - *42 U.S.C. § 410*
  - Heading: **CHAPTER 7-SOCIAL SECURITY > SUBCHAPTER II-FEDERAL OLD-AGE, SURVIVORS, AND DISABILITY INSURANCE BENEFITS**

