Définitions
1.AdjectiveBy or across land."Let's take the overland route."
2.AdverbOver, across, or by land.
3.NounA trip by land between the UK and the Indian subcontinent or Australia, or between the UK and South Africa."(Can we add an example for this sense?)"
4.VerbTo transport (especially sheep or other farm animals) over land.
5.VerbTo travel across land.
6.VerbTo go on a recreational expedition to a remote destination, often with the aid of an off-road vehicle.