Similarly, an open relationship in which all participants are long-term friends might be considered "polyamorous" under broader usages of the word but excluded from some of the stricter usages (see further discussion below). There is enough overlap between these concepts that the expression "open relationship" is also sometimes used as a catch-all substitute when speaking to people who may not be familiar with the term "polyamory". However, some have objected to this shorthand, on the basis that multiple partners does not necessarily imply that they also have open relationships.