What is the meaning of Whisper?

The act of speaking in a quiet voice, especially, without vibration of the vocal cords.

A rumor.

A faint trace or hint (of something).

A low rustling sound, like that of the wind in leaves.

A private message to an individual in a chat room.

To speak softly, or under the breath, so as to be heard only by one near at hand; to utter words without sonant breath; to talk without that vibration in the larynx which gives sonorous, or vocal, sound.

To mention privately and confidentially, or in a whisper.

To make a low, sibilant sound.

To speak with suspicion or timorous caution; to converse in whispers, as in secret plotting.

To address in a whisper, or low voice.

To prompt secretly or cautiously; to inform privately.

To send a private message to an individual in a chat room.

Source: wiktionary.org