# § 290a. Definitions
For the purposes of this chapter:
**(1)** **Standard reference data** The term “standard reference data” means data that is—
**(A)** either—
**(i)** quantitative information related to a measurable physical, or chemical, or biological property of a substance or system of substances of known composition and structure;
**(ii)** measurable characteristics of a physical artifact or artifacts;
**(iii)** engineering properties or performance characteristics of a system; or
**(iv)** 1 or more digital data objects that serve—
**(I)** to calibrate or characterize the performance of a detection or measurement system; or
**1** to interpolate or extrapolate, or both, data described in subparagraph (A) through (C); [^1] and
So in original.
**(B)** that is critically evaluated as to its reliability under section 290b of this title.
**(2)** **Secretary** The term “Secretary” means the Secretary of Commerce.
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**Source Credit**: (Pub. L. 90–396, § 2, July 11, 1968, 82 Stat. 340; Pub. L. 114–329, title I, § 108, Jan. 6, 2017, 130 Stat. 2987.)
## Editorial Notes
### Amendments
2017— amended section generally. Prior to amendment, text read as follows: “For the purposes of this chapter—
“(a) The term ‘standard reference data’ means quantitative information, related to a measurable physical or chemical property of a substance or system of substances of known composition and structure, which is critically evaluated as to its reliability under .
“(b) The term ‘Secretary’ means the Secretary of Commerce.”