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observation
observation car
observation post
observatory
observe
observer
observingly
obsess
obsession
obsessive
obsessive-compulsive
obsessive-compulsive disorder
obsidian
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obsolescent
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obstacle
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obsession

ob·ses·sion [ əb sésh'n, ob sésh'n ] (plural ob·ses·sions)


noun 
Definition:
 
1. preoccupation: an idea or feeling that completely occupies the mind
His obsession with figures led him to make crucial economic mistakes.

2. state of being obsessed: the state of being obsessed by somebody or something
Their devotion to each other borders on obsession.

3. psychiatry uncontrollable persistence of idea: the uncontrollable persistence of an idea or emotion in the mind, sometimes associated with psychiatric disorder


ob·ses·sion·al adjective
ob·ses·sion·al·ly adverb
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