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Possible definitions for junction

function
In mathematics, an expression, rule, or law that defines a relationship between one variable (the independent variable) and another (the dependent variable), which changes along with it. Most functions are numerical; that is, a numerical input value is associated with a single numerical output value. The formula , for example, assigns to each positive real number the area of a circle with a radius of that length. The symbols and are typically used for functions of the independent variable . A multivariable function such as is a rule for deriving a single numerical value from more than one input value. A periodic function repeats values over fixed intervals. If for any value of is a periodic function with a period of length (a constant). The trigonometric functions are periodic. See also density function, exponential function, hyperbolic function, inverse function, transcendental function.


auction
Buying and selling of property through open public bidding. Typically, potential purchasers make a succession of increasing bids or offers until the highest (and final) bid is accepted by the auctioneer. At a so-called Dutch auction, by contrast, the seller offers property at successively lower prices until one of his offers is accepted or until the price drops so low as to force the withdrawal of the offered property. Prospective buyers are usually allowed to examine auction items beforehand, and sellers may set a minimum price below which the property will not be sold. Auctions are important in the agricultural markets of many countries, permitting the rapid sale of perishable goods. Other items often sold at auction include artwork and antiques, secondhand goods, and farms and buildings repossessed by banks or the government. Auction selling is also employed on stock and commodity exchanges.

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