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In the context of Article 100 of the National Electrical Code (NEC), a bathroom is specifically defined as a space that must contain at least one water closet, and more commonly, it includes certain essential components for it to qualify as such. Among these components, the presence of a basin (also known as a sink) is a key requirement.

The basin is crucial because it provides a water source for activities such as handwashing and grooming, which are essential functions typically associated with a bathroom. The definition emphasizes the practical purpose of the bathroom as a room designed for hygienic activities, making the basin a necessary fixture.

While other fixtures like a shower, a toilet, or a mirror might commonly be found in bathrooms, they are not necessarily required for a space to be classified as a bathroom under the NEC. For example, a bathroom can technically exist without a shower or mirror, as long as it includes the necessary plumbing fixture that qualifies it as a bathing or washing area. Thus, the inclusion of the basin as a defining characteristic of a bathroom aligns perfectly with the requirements set forth in Article 100.