English Lexicon

Fixed Idea

/ˈfɪkst aɪˈdiːə/
nounCEFR C1 (Advanced)Top #8500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    An idea that dominates the mind; an obsessive preoccupation or unwavering belief that persists despite contrary evidence.

    "Traveling around the world became a fixed idea that completely consumed his savings and plans."
  2. 2

    In psychology and psychiatry, a persistent belief or delusion that holds absolute sway over a person's thoughts and actions.

    "The detective recognized that the suspect's obsession had progressed from a mere theory into a fixed idea."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the French 'idée fixe' (coined by French composer Hector Berlioz in 1830 to describe a recurring musical theme, and later adopted into psychology and general lexicon). The term combines 'fixed' (from Old French 'fixer', Latin 'fixus') and 'idea' (from Greek 'idea', form/pattern). Over time, it evolved to denote an obsessive preoccupation or unwavering concept dominating the mind.

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