attachment

The act or process of (physically or figuratively) attaching.

The “implantation window” is a short, specific phase during which attachment of the blastocyst occurs.

A strong bonding with or fondness for someone or something.

I have such an attachment towards my fiancé!

A dependence, especially a strong one.

Through every other kind of drug experience, however, ran his attachment to alcohol.

A device attached to a piece of equipment or a tool.

Zimchenko's phone had a tape attachment, […]

The means by which something is physically attached.

[The umbilical cord is] the attachment connecting the fetus with the placenta.