on order meaning

Having been ordered but not yet supplied

[American idiom]
ordered with delivery expected.
• Your car is on order. It'll be here in a few weeks.
• I don't have the part in stock, but it's on order.

[American slang]
ordered with delivery expected.
  Your car is on order. It'll be here in a few weeks.
  I don't have the part in stock, but it's on order.

Examples

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1. i have got two books on order at the bookshop.
2. cancellations on orders are pouring in from all over the world.
3. the book is on order.
4. to cut down on orders for ice and soft drinks, many hotels nowadays have machines on each floor to dispense these items.
5. research of holospectrum technique based on order tracking