An attachment is something that is fastened to something else, like a file added to an email or a tool added to a machine; it can also mean a strong emotional connection to a person, thing, or idea.
It is formed from *attach* plus the noun-making suffix *-ment*, and has been used since Middle English. The emotional sense grew from the physical idea of being fastened or bound.
Psychologists use 'attachment' to describe the deep bonds babies form with caregivers, which can shape relationships for life. The metaphor is precise: early emotional glue can be flexible and healthy or tight and restrictive.
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