Partial Shipment or Split Shipment

This is a delivery of a single order in more than one parcel. This situation occurs when a product, for example, consists of several parts which cannot be sent in one shipment or when an order includes several products and some of them are not available at the moment (in this case we speak of backorders). Shipments are often delivered on different days. 

You can read more about this topic in the post below:

10 tips on how to prepare your ecommerce logistics for high season