Irreversibileista

Irreversibileista is a neologism used to describe a proponent or adherent of irreversibility in discussions about time and change. The term combines a root related to irreversibility with the -ista suffix, signaling a practitioner or advocate. It is not a widely standardized label in major reference works and appears mainly in niche or polemical writings.

In philosophy of time, irreversibileistas are typically associated with the view that there is an objective direction or arrow of time that cannot be fully reversed by physical or causal processes. Their position is often linked to entropy or to the asymmetry of memory, causality, and prediction. In physics, the term is sometimes used to describe those who emphasize macroscopic irreversibility as a fundamental feature of nature, or as a real consequence of statistical principles like the second law of thermodynamics, rather than as an emergent or epistemic artifact. Some writers extend the label to discussions of historical or ethical change, viewing certain outcomes as permanent once they occur.

Reception of the term is mixed. Critics argue that it overstates a consensus, noting that many theories maintain that reversible microdynamics underlie apparent macroscopic irreversibility, and that irreversibility can be modeled as emergent, context-dependent, or epistemic rather than ontological. As a niche label, irreversibileista has limited formal usage but can appear in debates distinguishing reversible versus irreversible accounts of time, change, and entropy.

See also: arrow of time, entropy, thermodynamics, philosophy of time, irreversibility.