Noun
minhag (plural minhags or minhagim)
(Judaism) a longstanding religious custom or tradition that is not required by Jewish law
My family's minhag is to sit while saying kiddush.
The Persian Jews have a Passover minhag to beat each other with vegetables when singing Dayenu.
By and large, however, the differences result from the historic dispersal of the Jews and the consequent development of differences among regions in their practices (see minhag ). Source: Internet
Instead, they recommended that selected features will be readopted and new observances established in a piecemeal fashion, as spontaneous minhag (custom) emerging by trial and error and becoming widespread if it appealed to the masses. Source: Internet