What is abstract noun for attach?

There isn't a single perfect abstract noun for "attach." It depends on the context and what kind of attachment you're talking about. Here are a few options, each with slightly different meanings:

* Attachment: This is the most general and direct abstract noun for "attach." It refers to the state of being attached or the act of attaching.

* Bond: This implies a stronger, more emotional connection or relationship, often between people.

* Connection: This focuses on the link or relationship between two things, often physical or abstract.

* Affiliation: This implies a formal connection or membership, usually to an organization or group.

* Affinity: This refers to a natural attraction or connection, often based on shared interests or values.

Ultimately, the best abstract noun for "attach" will depend on the specific situation and the type of attachment you're trying to describe.