attachment
This word carries a dual nature of connection, ranging from the warmth of emotional bonds to the cold rigidity of mechanical or legal fasteners. When used emotionally, it often suggests a dependency or a psychological tie that can be either comforting or restrictive, depending on whether the context is about love or an inability to let go. In technical or digital contexts, it describes a secondary entity that relies on a primary host to be useful. Whether it is a vacuum cleaner nozzle or a PDF in an email, the object is defined by its relationship to a larger system, emphasizing a state of being appended rather than standing alone.
Countable when referring to specific physical accessories or digital files. Uncountable when describing the general emotional state of feeling connected to someone.
Meanings
A feeling of affection or emotional fondness toward a person or thing.
"He felt a deep attachment to his childhood home."
An extra part or accessory that can be joined to a main machine to perform a specific task.
"The mixer comes with a dough hook attachment."
A computer file sent along with an email message.
"Please see the attached invoice in the attachment."