intransitive verb

1. to speak very softly, esp. without the resonance produced by the vibration of the vocal cords
2. to talk quietly or furtively, as in gossiping, maligning, or plotting
3. to make a soft, rustling sound like a whisper, as the leaves of a tree

Etymology: ME whisperen < OE hwisprian, akin to wispern < IE base *wei-, to whiz, hiss > whine, whistle

transitive verb

1. to say very softly, esp. by whispering
2. to tell (something) to (someone) privately or as a secret

noun

1. the act or an instance of whispering; specif., soft, low speech produced with breath but, usually, without vibrating the vocal cords to speak in a whisper
2. 1. something whispered
   2. a secret, hint, rumor, etc.
3. a soft, rustling sound like a whisper