### Question
What is the definition of retirement system?


### Answer
The definition of **retirement system** is as follows 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 6-THE CHILDREN'S BUREAU > SUBCHAPTER II-FEDERAL OLD-AGE, SURVIVORS, AND DISABILITY INSURANCE BENEFITS**

