Etymology
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anxiety (n.)

1520s, "apprehension caused by danger, misfortune, or error, uneasiness of mind respecting some uncertainty, a restless dread of some evil," from Latin anxietatem (nominative anxietas) "anguish, anxiety, solicitude," noun of quality from anxius "uneasy, troubled in mind" (see anxious).

Sometimes considered a pathological condition (1660s); psychiatric use dates to 1904. Age of Anxiety is from Auden's poem (1947). For "anxiety, distress," Old English had angsumnes, Middle English anxumnesse.

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Definitions of anxiety

anxiety (n.)
(psychiatry) a relatively permanent state of worry and nervousness occurring in a variety of mental disorders, usually accompanied by compulsive behavior or attacks of panic;
Synonyms: anxiousness
anxiety (n.)
a vague unpleasant emotion that is experienced in anticipation of some (usually ill-defined) misfortune;
From wordnet.princeton.edu