n. One who engages in adventure; an undertaker of uncertain or hazardous actions or enterprises, as in travel, war, trade, speculation, etc.: as, the Young Adventurer, a title given to Prince Charles Edward Stuart on account of his leading the desperate insurrection of 1745.n. In general, one who undertakes any great commercial risk or speculation; a speculator; in mining, a shareholder in or promoter of mines, particularly under the cost-book system. See cost-book.n. In a bad sense, a seeker of fortune by underhand or equivocal means; a speculator upon the credulity or good nature of others; especially, one who ingratiates himself with society by false show or pretense in order to gain a surreptitious livelihood.