Well, the word is included in many dictionaries. Most of them state that it is a word of Anglo Indian origin. Native speakers of English, however do not use this word to refer to a light meal. They prefer to use the word “snack” instead of “tiffin”. According to some scholars, “tiffin” comes from “tiff”. One of the meanings of “tiff” in British English is “to sip or drink”. Did you know that Tiffin is also the name of a place?