When talking about programming languages, the term "rvalue" refers to a temporary value that can be assigned to an object or used in an expression, but cannot have its own address in memory. Synonyms for the concept of "rvalue" include "temporary value", "temp value", "non-persistent value", or even "immediate value". These terms all describe a value that is short-lived and used only for a particular operation or assignment. Understanding the various synonyms for "rvalue" can aid programmers in accurately expressing and discussing the concept in their code and conversations within the programming community.