A. A habitual observe of anyone: my custom of studying a bit before slumber. See Synonyms at behavior. syn: custom, practice, follow imply an established means of doing factors. custom, applied to a community or to someone, implies a roughly everlasting strategy for acting reinforced by tradition and social attitudes: https://custom-felt-pennant21653.blogdun.com/38836868/details-fiction-and-custom-baseball-pennants