A distributor is a device in the engine block of an internal combustion engine that routes low voltage from the engine block to the spark plugs in the correct firing order.
http://en.wikipedia.org/wiki/Distributor

Distributor, who sells to retailers, Retailer (also called dealer or reseller), who sells to end customers; Advertisement typically used for consumption goods
http://en.wikipedia.org/wiki/Distribution_(business)

distributor n. One that distributes, especially a device that applies electric current in proper sequence to the spark plugs of an engine
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dis·trib·u·tor (d-str b y-t r) n. 1. One that distributes, especially a device that applies electric current in proper sequence to the spark plugs of an engine.
http://www.thefreedictionary.com/distributor