AITR is an abbreviation that stands for 'Adult in the Room.' It refers to a person who is level-headed, rational, and capable of making sound decisions in a given situation. This person is often seen as the voice of reason in a group and helps to prevent others from making rash or impulsive decisions.
AITR is a relatively new abbreviation and is not yet widely recognized or used. It is more commonly used in professional or academic settings where mature and responsible behavior is expected.