Cake: [keyk] noun a sweet, baked, breadlike food, made with or without shortening, and usually containing flour, sugar, baking powder or soda, eggs, and liquid flavoring. (source: dictionary.com)

Etymology: 

This sweet term came to us circa the year 1230 from Old Norse kaka "cake," from the West Germanic "kokon-", from the Proto-Indo-European base "gag-" or "gog-", which meant "something round, lump of something." 

Surprise, surprise: Cake is not related to the Latin coquere ("to cook") as formerly supposed. Replaced its Olde English cognate (cognate = two words that have a common origin), coecel. 

Originally (until c.1420) it meant "a flat, round loaf of bread." (source: etymoline.com)

Of course, if you're wondering how it made the leap from referring to a flat, round loaf of bread to the delicious confection that we call cake today, here's a little excerpt from Foodtimeline.org:

 

According to the food historians, the precursors of modern cakes (round ones with icing) were first baked in Europe sometime in the mid-17th century. This is due to primarily to advances in technology (more reliable ovens, manufacture/availability of food molds) and ingredient availability (refined sugar)....The first icing were usually a boiled composition of the finest available sugar, egg whites and [sometimes] flavorings...It was not until the middle of the 19th century that cake as we know it today (made with extra refined white flour and baking powder instead of yeast) arrived on the scene...Butter-cream frostings (using butter, cream, confectioners [powdered] sugar and flavorings) began replacing traditional boiled icings in first few decades 20th century. In France, Antonin Careme [1784-1833] is considered THE premier historic chef of the modern pastry/cake world. You will find references to him in French culinary history books.

(Note: if you're interested in more Cake Lore, you might also want to check out Leslie F. Miller's book Let Me Eat Cake) 

First known publication: 

"What man, I trow ye raue, Wolde ye bothe eate your cake and haue your cake?" ["The Proverbs & Epigrams of John Heywood," 1562] (source: etymonline.com)

Idioms: 

A piece of cake: something easily done: She thought her first solo flight was a piece of cake.
Take the cake: a. to surpass all others, esp. in some undesirable quality; be extraordinary or unusual: His arrogance takes the cake.
b. to win first prize.

Let them eat cake: this is from Rousseau's "Confessions," in reference to an incident c.1740, when it was already proverbial, long before Marie Antoinette. The "cake" in question was not a confection, but a poor man's food. (source for these idioms: etymonline.com)

(CakeSpy Tip: If you're into idioms, bet you'll love Chocolate & Zucchini's "Edible Idiom" series!)

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