What "temporary variable" is?

[languagelawyer]

[conv]/3, [conv]/4, [conv]/6 and [expr.static.cast]/4 are using this term combination of words. What does it mean?

[jwakely]

Does [class.temporary] not help?

[languagelawyer]

No, it does not.

[jensmaurer]

Editorial meeting: Normative wording seems wrong. We don't say what the scope and lifetime of the temporary variable is. Also, there might not be a temporary to start with (just a prvalue that initalizes something else eventually). The word "temporary" is problematic here, it's loaded plus the temporary (object) is not created at this point. Say "invented" or "hypothetical" variable t, and "would be well-formed".

[jensmaurer]

[tuple.creation] just means "temporary objects".