Definition of "adventurer"

European adventurers found themselves within a watery world, a tapestry of streams, channels, wetlands, lakes and lush riparian meadows enriched by floodwaters from the Mississippi River.

2013 January, Nancy Langston, “The Fraught History of a Watery World”, in American Scientist‎, volume 101, number 1, archived from the original on 22 January 2013, page 59

Meanwhile, the ranks of adventurers grow, be they manic puzzle-solvers or people like me, who like to look under the Robners' beds just for the hell of it.

1983 July, PC Mag, volume 2, number 2, page 351

It's a challenging game for the inexperienced adventurer, and should even give the hardened pros a bit of a run for their money.

1992, Tim Kemp, Microfair Madness (game review in Your Sinclair issue 75, March 1992)