purchase order:
"The contractual agreement with a supplier of goods or services that specifies payment terms, delivery dates, item identification, quantities, freight terms and all other obligations and conditions. The order may specify multiple items and delivery dates, but is always generated for a single vendor. (Purchase order , The purchaser's authorisation used to formalise a purchase transaction with a supplier. )"

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Definitions of terms related to purchase order:

• Blanket order
• Conomic order quantity
• Customer order
• Engineering change order
• Firm planned order
• Make or buy analysis
• Manufacturing order
• Open order
• p chart
• Period order quantity
• planned order
• planned order receipt
• planned order release
• Planned orders
• production order
• purchase price variance (PPV)
• purchase to order (PTO)
• purchase to stock (PTS)
• purchase-to-pay cycle
• Shop order
• Standing orders
• work order