A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Unidentified Impurity

An unidentified impurity is defined as an Impurity that is identified solely by qualitative analytical properties, e.g. chromatographic retention time.

Unplanned Maintenance

Unplanned Maintenance is any maintenance, which must be conducted on short notice because of an occ0orence, also known as breakdown maintenance or repair.

US Health Agency

The United States Food and Drug Administration (FDA).

User Requirement Specification-URS

The user specifications are the specifications written down in a document describing in detail the requirements of the customer (user) with which the e.g. product, materials, process or computer system must confirm.