1. To watch or listen to a particular broadcast. The term originates from the need to "tune" a radio or television to a specific station or channel for a particular program. Be sure to tune in tomorrow, when we'll have the results of the big contest! We have over 2 million viewers tuning in to our show every week.
2. To pay attention to, become aware of, or be responsive (to someone or something). My father never tuned in when we were growing up. Our mother essentially raised us on her own. Would you mind tuning in to your brother for a little while? I need to go get dinner ready.
Aware of, responsive to, or able to understand (someone or something). A lot of parents aren't tuned in to their kids' real desires or ambitions. I don't know what's wrong with him, but Jim hasn't been tuned in lately at all.
aware; up-to-date. Jan is tuned in and alert to what is going on around her. Hey, Jill! Get tuned in, why don'tyou?
tuned inaware of or able to understand something. informal
1994 Today's Parent It is more important to be tuned in to your child's needs than to be the boss.
mod. aware; up-to-date. Jan is tuned in and alert to what is going on around her.