Definition of sound noun from the Oxford Advanced Learner's Dictionary

Oxford3000

sound

noun
saʊnd
 
; saʊnd
 
 
 

something you hear

1 [countable] something that you can hear
Synonym
noise
a high/low sounda clicking/buzzing/scratching, etc. soundthe different sounds and smells of the forestShe heard the sound of footsteps outside.He crept into the house trying not to make a sound.
2 [uncountable] continuous rapid movements (called vibrations) that travel through air or water and can be heard when they reach a person's or an animal's earSound travels more slowly than light.
 

from television/radio

3 [uncountable] what you can hear coming from a television, radio, etc, or as part of a film/movieCould you turn the sound up/down?The sound quality of the tapes was excellent.
 

of musicians

4 [countable, uncountable] the effect that is produced by the music of a particular singer or group of musiciansI like their sound.
 

impression

5 [singular] the sound of something the idea or impression that you get of somebody/something from what somebody says or what you readThey had a wonderful time by the sound of it.From the sound of things you were lucky to find him.They're consulting a lawyer? I don't like the sound of that.
 

water

6 [countable] (often in place names) a narrow passage of water that joins two larger areas of water
Synonym
strait
Plymouth Sound
Idioms

like, etc. the sound of your own voice

(disapproving) to like talking a lot or too much, usually without wanting to listen to other peopleShe's much too fond of the sound of her own voice.

within (the) sound of something

(British English) near enough to be able to hear somethinga house within sound of the sea
Usage noteUsage note: noise / soundNoise is usually loud and unpleasant. It can be countable or uncountable:Try not to make so much noise. What a terrible noise!Sound is a countable noun and means something that you hear:All she could hear was the sound of the waves. You do not use words like much or a lot of with sound.