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Noun. 1. tan-a browning of the skin resulting from exposure to the rays of the sun. sunburn, suntan, burn. hyperpigmentation-unusual darkening of the skin.
Transaction authentication number. A transaction authentication number (TAN) is used by some online banking services as a form of single use one-time passwords to authorize financial transactions. TANs are a second layer of security above and beyond the traditional single-password authentication.