Contamination

To make impure, infected, corrupt, etc, by contact with or addition of something; to pollute something. When a foreign material invades another material, either intentionally, by accident, or as a consequence of another set of actions. Cross contamination is where someone or something that is already contaminated transfers the contamination to another person or object.

Radioactive material deposited or dispersed in materials or places where it is not wanted.

1. The introduction of data of one security [classification or] security category into data of a lower security classification or different security category. [2382-pt.8] [ INFOSEC -99]. 2. Relative to numbering guidelines and FCC regulations, contamination occurs when at least one telephone number within a thousands-block of telephone numbers is not available for assignment to end users or customers. Blocks contaminated up to and including 10 percent are eligible for donation. For purposes of this provision, a telephone number is "not available for assignment" if it is classified as administrative, aging, assigned, intermediate, or reserved as defined in FCC rules (FCC 00-104, §52.7 (h)).