What does adventure mean?
The definition of adventure
Ad*ven”ture, n.
Etym: [OE. aventure, aunter, anter, F. aventure, fr. LL. adventura, fr. L. advenire, adventum, to arrive, which in the Romance languages took the sense of “to happen, befall.” See Advene.]

1 That which happens without design; chance; hazard; hap; hence, chance of danger or loss. Nay, a far less good to man it will be found, if she must, at all adventures, be fastened upon him individually. Milton.
2 Risk; danger; peril. [Obs.] He was in great adventure of his life. Berners.
3 The encountering of risks; hazardous and striking enterprise; a bold undertaking, in which hazards are to be encountered, and the issue is staked upon unforeseen events; a daring feat. He loved excitement and adventure. Macaulay.
4 A remarkable occurrence; a striking event; a stirring incident; as, the adventures of one’s life. Bacon.
5 A mercantile or speculative enterprise of hazard; a venture; a shipment by a merchant on his own account. A bill of adventure (Com.), a writing setting forth that the goods shipped are at the owner’s risk.

Synonyms
— Undertaking; enterprise; venture; event.

Ad*ven”ture, v. t.
[imp. & p. p. Adventured; p. pr. & vb. n.Adventuring.]
Etym: [OE. aventuren, auntren, F. aventurer, fr. aventure. See Adventure, n.]

1 To risk, or hazard; jeopard; to venture. He would not adventure himself into the theater. Acts xix. 31.
2 To venture upon; to run the risk of; to dare. Yet they adventured to go back. Bunyan, Discriminations might be adventured. J. Taylor.

Ad*ven”ture, v. i.
To try the chance; to take the risk. I would adventure for such merchandise. Shak.