Please wait until you hear the dialling tone ( the sound that a phone makes when it is ready to be used).Tonality, a system of music based on a key "center or tonic.Pure tone is a tone with a sinusoidal waveform.

Her tone was mocking.Their tone was friendly.Don't use that rude tone of voice with.

B2, c one of the continuous sounds that you hear on a phone that tell you if the other phone is ringing, if it is busy, etc.: I've called him several times but I keep getting the engaged tone.The Beauty Mask nourishes your skin and improves its tone.The tone and content of this draft resolution can only serve to undermine the peace process.