Deception  [di’sepsh?n]  

noun

1. a trick or ruse; the act or art of intentionally deceiving someone; an action or plot undertaken to make someone believe something untrue; the state of being deceived 

2.outdated. Deception Bay: former name of the mouth of the Columbia River, circa 1788-1792, attributed to amateur British explorer and trader John Meares, who failed to locate the great fabled river, then called the Rio de San Roque by Spanish explorer, Bruno Heceta. Meares incorrectly assumed the river was a bay even as his ship floated in its headwaters. He is also credited with naming Cape Disappointment on the same voyage for obvious reasons 

Origin:

First spelled in English, decepcioun, around 1410. Borrowed from the Middle French, déception, pulled directly from the Late Latin, deceptionem, from the Latin, deceptus, meaning, to deceive.  

Meares later named the mouth indentation area of the river Deception Bay. Then, having failed to discover the river, sailed north again to his headquarters.

Vancouver concluded that what Meares had called Deception Bay was just that.

[Vancouver] continued northward and not far from the Strait of Juan de Fuca encountered Captain Robert Gray, commanding the ship Columbia, of Boston. Gray gave Vancouver the information that he had seen evidence of a great river about where Heceta had mentioned. When the two ships parted, Gray started south again[.] On May 11, 1792, he crossed the bar of the river in question, and named it after his ship.

?Jean Hazeltine, The Discovery and Cartographical Recognition of Shoalwater Bay, Oregon Historical Quarterly, Vol. 58, No. 3, Sept. 1957