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1.
Triple sec is a strong, clear orange-flavored liqueur. It is sweet, but not cloying.

In addition to the generic brand Triple Sec, Curaçao, Cointreau, and Grand Marnier are also triple secs.

While triple sec usually would mean "triple dry", it here mans "triple distilled".

by KingTT June 21, 2003
 
2.
Triple sec, originally Curaçao triple sec, is a variety of Curaçao liqueur, an orange-flavoured liqueur made from the dried peels of bitter and sweet orange.

Triple sec may be drunk neat as a digestif or on the rocks, but nowadays is mostly used in making cocktails such as the Margarita, White Lady, and Cosmopolitan.
Triple sec is alcohol
by Allianse August 12, 2011