1.the particular auditory effect produced by a given cause;

the sound of rain on the roof

2.the subjective sensation of hearing something;

he strained to hear the faint sounds

3.mechanical vibrations transmitted by an elastic medium;

falling trees make a sound in the forest even when no one is there to hear them

4.the sudden occurrence of an audible event;

the sound awakened them

5.the audible part of a transmitted signal;

they always raise the audio for commercials

6.(phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language

7.a narrow channel of the sea joining two larger bodies of water

8.a large ocean inlet or deep bay;

the main body of the sound ran parallel to the coast

9.financially secure and safe;

sound investments

10.exercising or showing good judgment;

healthy scepticism

11.in good condition; free from defect or damage or decay;

a sound timber

12.in excellent physical condition;

good teeth

13.reflects weight of sound argument or evidence;

a sound argument

14.having legal efficacy or force;

a sound title to the property

15.free from moral defect;

a man of sound character

16.(of sleep) deep and complete;

a heavy sleep

17.thorough;

a sound thrashing

18.deeply or completely;

slept soundly through the storm