The term FIRST ARRIVAL can be broken down into two crossword solutions: ELDEST (6 letters) and ABORIGINE (9 letters). ELDEST is an adjective meaning the oldest or most senior member of a group. It is often used to describe the first-born child in a family. ABORIGINE is a noun referring to an indigenous person of Australia, the original inhabitants of the continent. The term is also used to refer to the earliest known human inhabitants of any land. Together, these two words suggest the concept of the first arrival, or the oldest and original inhabitants of a place.