Fax
/fæks/
Definition 1 of 2
Pro Tip 1/3Technologically Outdated
Even though 'fax' is modern English, the technology it refers to is often seen as outdated. 
Do you still use a fax at your office or do you prefer email?
Pro Tip 2/3Business Context
'Fax' is mostly used in business settings where official documents need to be sent quickly. 
Please provide your fax number so we can send the invoice.
Pro Tip 3/3Machine Required
To 'fax' something, you often need access to a fax machine, which is an electronic device. 
We have to go to the library to fax these forms.