Selfejection

Selfejection is a term occasionally used to describe the act of an entity ejecting itself from a larger system, typically through an internal mechanism rather than an external force applied by another party. It is not a standard technical term in most disciplines, and when it appears it is often a shorthand or informal way to indicate autonomous separation. In many fields, more precise terms are preferred, such as ejection, autotomy, evisceration, or dynamical ejection.

In engineering and spaceflight contexts, the closest concept is an autonomous or self-triggered ejection mechanism. Examples include automatic emergency releases or ejection seats that initiate separation in response to internal sensors or flight conditions. The emphasis is on self-initiated action rather than external control.

In biology, analogous processes are described as autotomy or evisceration, where an organism deliberately sheds tissue or organs to evade predation. While conceptually similar—self-induced removal from a system—these outcomes are described with specialized terminology that reflects their biological mechanisms rather than a general term like selfejection.

In astrophysics, selfejection may be used informally to refer to a star or other object becoming unbound from a cluster or galaxy due to internal dynamical interactions. Such events produce runaway objects and are typically studied with established concepts like dynamical ejection rather than the broad label selfejection.

Terminology varies by field, and selfejection remains more of a descriptive or colloquial label than a formal category. See also ejection, autotomy, evisceration, dynamical ejection, and runaway stars.