A small gift (especially one given by a merchant to a customer who makes a purchase)

• Something for good measure
• Gratuity
• City ace in Epping sent up small gift

Wikipedia Word definitions in Wikipedia
A lagniappe a small gift given to a customer by a merchant at the time of a purchase. Langniappe may also refer to: Lagniappe (newspaper) , an alternative newspaper in Mobile, Alabama Lagniappe (album) , a Hurricane Katrina benefit album by Saddle Creek ...

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.

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 ...