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JuniperusRain t1_ixrj4hc wrote

The word anxiety existed long before the clinical concept of an anxiety disorder and it did originally just mean nervousness or a troubled mind, so that casual usage is totally valid.

The first time dissociation was used to refer to a mental state was in the 19th century and it was considered a kind of hysteria. Casual, nonclinical use of the term is very recent.