a number associated with a purchase or merchandise order
Common data, which varies according to the lab, may include: an order number; thedate your prints were made; the negative's frame number; and any colour or densitycorrections that are made to it.
Examples of 'order number' in a sentence
order number
Despite having entered credit card details and receiving an order number, no product arrived and no payment was taken.
Times, Sunday Times (2012)
If they require a purchase order number for payment, make sure you have it before you start work.
Times, Sunday Times (2015)
Machinery order numbers are often taken as a guide to future capital spending plans.
Times, Sunday Times (2010)
I've spent hours on the phone trying to get connected to the internet, and received a total of four different order numbers for this.