: in a state in which the correct musical sound is played or sung
adjusted the guitar until it was in tune
: in a state in which people agree with or understand one another
The president and his followers were clearly in tune.
—usually + with The new supervisor is not in tune with the needs of the staff.
: in a state in which one thing agrees with or matches another
—usually + with
His formal clothing was in tune with the occasion.
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