A person or thing that makes something possible; in psychology, someone who allows another's unhealthy behavior by removing natural consequences.
From enable plus the agent suffix -er (Old English -ere). Originally neutral, it gained a negative psychological connotation in the 20th century.
The word 'enabler' has two very different meanings: in business, an enabler is good (like software that enables work), but in psychology, being an enabler is usually bad—it describes someone whose help actually prevents another person from getting better or taking responsibility!
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