A more thorough explanation:

Term: in itinere
Definition: In itinere means "on a journey" or "on the way". This term was used to describe the justices in eyre (justices on a journey) and goods that were being transported to a buyer. For example, if a person is traveling from one city to another, they are "in itinere". Similarly, if a company is shipping products from one location to another, those products are "in itinere".
Examples:
- The family was "in itinere" to their vacation destination.
- The package was lost "in itinere" and never reached its destination.
These examples illustrate the definition of "in itinere" as both involve being on a journey or in transit.