Nonremovable

Nonremovable is an adjective used to describe something that cannot be removed by ordinary means. In everyday language it may refer to permanently attached or designed-to-be-permanent items, such as nonremovable fasteners, nonremovable adhesives, or labels that are intended to stay with a product for its lifetime. The term is often paired with antonyms removable or detachable to contrast different design choices or maintenance requirements. In engineering and manufacturing, a nonremovable component is one that is joined or bonded in a way that requires specialized tools or processes to separate, such as riveted joints, welded connections, or permanent seals.

In mathematics, the phrase nonremovable can describe a nonremovable singularity of a function in complex analysis: a point in the domain where the function cannot be redefined to make it analytic. This contrasts with removable singularities, where redefining the function at that point yields an analytic function. Nonremovable singularities include poles and essential singularities and are central to the study of analytic continuation.

In dentistry and orthodontics, nonremovable appliances or retainers are fixed to teeth, such as braces or lingual retainers, in contrast to removable appliances like clear aligners or removable retainers. The term indicates that removal by the patient is not intended as part of normal use. Nonremovable devices can be used for long-term stabilization or correction.

Labeling something as nonremovable may imply permanence but may not be absolute; removal could require invasive procedures, irreversible alteration, or specialized equipment. Ethical and safety considerations arise when labeling medical or consumer products as nonremovable, to ensure informed use and maintenance.