[tialaramex]

Generally in SF genre fiction "Martian" means a space alien, a being native to the planet Mars e.g. the antagonists in "War of the Worlds" are Martians.

However the word can also mean, and does in the case of the novel, a person who merely lives on the planet Mars, as Mark Wayney does.

[stavros]

Hm, right. I somehow never really saw those two as different, hm.