1. Advertisement
To advertise to announce publicly by a printed notice
They advertised a sale on office equipment in the newspaper.
2. To attach
Attachment a device attached to a machine
The ditto machine had an attachment for sorting copies.
3. Attention
Attention line the person to whom a letter is sent, usually placed above the salutation in a business letter
I put an attention line on my letters because they are handled faster when they reach the proper person directly.
Attentive paying attention, observant
When the vice president meets with the employees, we must be attentive and listen carefully to every word of instruction.
4. Enclosure
To enclose to include an item with something else, as in a parcel or envelope
I enclosed a copy of the agenda with each letter.
5. To require
Requirement something needed
The requirements made the position very difficult to fill.
Requisition a request for something needed
We filled out a requisition form for additional materials.