The fact that Brianna knew that 1:00 meant 2:00 to her friend means that she use chronemics as a nonverbal communication.
Nonverbal communication refers to anything used to communicate other than words. This can include gestures, facial expressions, and body language, for example.
Chronemics refers to the use of time in nonverbal communication. Different people have different understandings of the meaning of time. Such understandings can impact their relationship.
In the example given in the question, we see that Brianna knows how to interpret her friend's meaning of time. She knows there is no point in arriving at 1:00. Brianna is using chronemics and adjusting her behavior to better suit the relationship with her friend.
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