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• Something for good measure
• Gratuity
• A small gift (especially one given by a merchant to a customer who makes a purchase)

Wikipedia Word definitions in Wikipedia
A lagniappe is "a small gift given a customer by a merchant at the time of a purchase" (such as a 13th doughnut on purchase of a dozen ), or more broadly, "something given or obtained gratuitously or by way of good measure." The word entered English from ...

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"dividend, something extra," 1849, from New Orleans creole, of unknown origin though much speculated upon. Originally a bit of something given by New Orleans shopkeepers to customers. Said to be from American Spanish la ñapa "the gift." Klein says this ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Lagniappe \La*gniappe\, Lagnappe \La*gnappe"\, n. [Also spelled lagnappe . Etym. uncertain.] In Louisiana, a trifling present given to customers by tradesmen; a gratuity. Lagniappe . . .is something thrown in, gratis, for good measure. --Mark Twain. A tip ...

WordNet Word definitions in WordNet
n. a small gift (especially one given by a merchant to a customer who makes a purchase)

Wiktionary Word definitions in Wiktionary
n. (context Louisiana Mississippi Trinidad and Tobago uncommon English) An extra or unexpected gift or benefit, such as that given to a customer when they purchase something else.