not subject or susceptible to change or variation in form or quality or nature; "the view of that time was that all species were immutable, created by God"
a familiar name for a person (often a shortened version of a person's given name); "Joe's mother would not use his nickname and always called him Joseph"; "Henry's nickname was Slim"
a descriptive name for a place or thing; "the nickname for the U.S. Constitution is `Old Ironsides'"