Functional decline risks becoming the acopia of the 21st centuryAcopia is loosely used by some to describe an individual's failure to overcome the insults and burdens of one's circumstance. 1 When this pejorative term crept into medical parlance is unknown, but by the early 2000s, acopia was banned in some Australian hospitals. 2 The term's etymology began in the 1400s, when to cope was to 'engage in combat'. 3 Evolving by the 1800s, to cope meant to 'handle [a situation] successfully'. 3 But in the late 1900s, cope was Latinised and polarised and became acopia.We support the call that acopia only be used as a proper noun in reference to the mountainous village in Peru, Acopia. 4 The use of acopia in clinical settings places blame on the individual and fails to explore the underlying multifactorial causes of a person's changed circumstances. 1 Cohort studies of those diagnosed with acopia found these adults are older, mostly women, cognitively impaired, frail and living with multimorbidity, and over 90% have an underlying reversible illness precipitating admission which can benefit from interdisciplinary intervention. 1,5 Despite the persistence of acopia in medical documentation, like its etymological predecessors, it may have evolved again. Functional decline is common in medical documentation and literature and is used in connection with seeking to illustrate one's interaction with the environment relative to one's recent past. Like acopia, functional decline is often used as an isolated diagnosis without exploration of the underlying mechanisms causing decline. In this light, functional decline risks being the acopia of the 21st century.Neglecting to explore the causes of functional decline and to consider that decline a de novo phenomenon is ageism in its most insidious and deadly form. The persistence of ageism in healthcare and structural factors