What is the meaning of Highlander?

A person who inhabits the Scottish Highlands.

Any person who lives in mountainous or hilly terrain.

the Igorot people, referring to them coming from the Cordillera Mountain Range.

A game format in which players are allowed no more than one of any card (except basic resource cards) in their decks.

highlander

highlander; Highlander (someone from the Scottish Highlands)

Source: wiktionary.org