transitive verb

1. to fasten by sticking, tying, etc.
2. to make (a person or thing) part of; join: often used reflexively he attached himself to us
3. to connect by ties of affection, attraction, etc.
4. to add or affix (a signature, codicil, etc.)
5. to ascribe I attach great significance to the news
6. to appoint by authority or order
7. Law to take (property) into custody of a court by writ
8. Mil. to join (troops, a unit, etc.) temporarily to some other unit

Etymology: ME attachen < OFr atacher, altered by substitution of prefix < estachier, to attach < estache, a post, stake < Frank *stakka: see stick

intransitive verb