The fact that you say “table” in the presence of an English-speaking listener and “la mesa” in the presence of a Spanish-speaking listener, if there is a table present, illustrates the audience variable.
A type of controlling variable with the following features:
The audience is usually a listener in the presence of whom verbal behavior is typically reinforced
It controls a group of response forms
Whether or not the listener provides reinforcement for the current response
The size or specific nature of the response forms controlled