at·tach·ment 
/əˈtætʃmənt/ noun
plural at·tach·ments /əˈtætʃmənt/ noun 1 [count] : an extra part that can be used with a machine to make it do a particular job
▪ The vacuum cleaner attachments help clean in tight spaces. ▪ I need a longer attachment for the drill. 2 : strong feelings of affection or loyalty for someone or something [count] — usually singular ▪ the baby's attachment to his mother ▪ They all have a deep attachment to the old house. [noncount] ▪ People need emotional attachment. 3 [count] : a document or file that is sent with e-mail
▪ I'll send the document as an attachment to my next e-mail. 4 a [count] : a part that is used to connect or attach something
▪ The attachments that connect the rack to the car are rusted and should be replaced.
b [noncount] : the act of connecting or attaching something
▪ There are two brackets for attachment of the shelf.
▪ The vacuum cleaner attachments help clean in tight spaces. ▪ I need a longer attachment for the drill.
▪ I'll send the document as an attachment to my next e-mail.
▪ The attachments that connect the rack to the car are rusted and should be replaced.
b [noncount] : the act of connecting or attaching something
▪ There are two brackets for attachment of the shelf.
on attachment
Brit : working for a limited time in a particular place — usually + to ▪ She's on attachment to Australia for a month.
