attach

at‧tach

1 [transitive] to fasten or connect one object to another [= fix]

attach something to something

Attach a recent photograph to your application form.

a small battery attached to a little loudspeaker

the attached form/cheque/leaflet etc

Please fill in and return the attached reply slip.

2

be attached to somebody/something

 to like someone or something very much, because you have known them or had them for a long time:

It's easy to become attached to the children you work with.

3

attach importance/significance etc to something

 to believe that something is important:

People attach too much importance to economic forecasts.

4 [intransitive and transitive] if blame attaches or is attached to someone, they are responsible for something bad that happens:

No blame can be attached to Roy for the incident.

5 [intransitive and transitive] if a quality, feeling, idea etc attaches or is attached to a person, thing, or event, it is connected with them

attach to

It's easy to let the emotions attached to one situation spill over into others.

6

be attached to something

a) to work for part of a particular organization, especially for a short period of time:

He was attached to the foreign affairs department of a Japanese newspaper.

b) to be part of a bigger organization:

The Food Ministry is attached to the Ministry of Agriculture.

7 [transitive] to connect a document or file to an email so that you can send them together

8

attach yourself to somebody

 to join someone and spend a lot of time with them, often without being invited or welcome:

A young man from Canada had attached himself to Sam.

9

attach a condition (to something)

 to allow something to happen, but only if someone agrees to do a particular thing or accept a particular idea:

When approving a merger, the commission can attach conditions.

10

attach a label to somebody/something

 to think of or describe someone or something as being a particular thing, especially in a very general way :

You can't really attach a label to this type of art.

Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.