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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.
DEFINITION of 'Transaction Authentication Number (TAN)' A one-time code used in the processing of online transactions. A transaction authorization number (TAN) represents an additional layer of security beyond a password to securely log into an account or conduct a transaction.