1. [n]  the particular auditory effect produced by a given cause; "the sound of rain on the roof"; "the beautiful sound of music"
2. [n]  the subjective sensation of hearing something; "he strained to hear the faint sounds"
3. [n]  the audible part of a transmitted signal; "they always raise the audio for commercials"
4. [n]  (phonetics) an individual sound unit of speech without concern as to whether or not it is a phoneme of some language
5. [n]  the
6. [n]  a large ocean inlet or deep bay; "the main body of the sound ran parallel to the coast"
7. [n]  a narrow channel of the sea joining two larger bodies of water
8. [n]  mechanical vibrations transmitted by an elastic medium; "falling trees make a sound in the forest even when no one is there to hear them"
9. [adv]  deeply or completely; "slept soundly through the storm"; "is sound asleep"
10. [adj]  thorough; "a sound thrashing"
11. [adj]  (of sleep) deep and complete; "a heavy sleep"; "fell into a profound sleep"; "a sound sleeper"; "deep wakeless sleep"
12. [adj]  in excellent physical condition; "good teeth"; "I still have one good leg"; "a sound mind in a sound body"
13. [adj]  exercising or showing good judgment; "healthy scepticism"; "a healthy fear of rattlesnakes"; "the healthy attitude of French laws"; "healthy relations between labor and management"; "an intelligent solution"; "a sound approach to the problem";"sound advice"; "no reasonable explanation for his decision"
14. [adj]  free from moral defect; "a man of sound character"
15. [adj]  financially secure and safe; "sound investments"; "a sound economy"
16. [adj]  in good condition; free from defect or damage or decay; "a sound timber"; "the wall is sound"; "a sound foundation"
17. [adj]  having legal efficacy or force; "a sound title to the property"
18. [adj]  reflects weight of sound argument or evidence; "a sound argument"
19. [v]  measure depths with a sounding line, as of a body of water
20. [v]  utter with vibrating vocal chords
21. [v]  appear in a certain way; "This sounds interesting"
22. [v]  give off a certain sound or sounds; "This record sounds scratchy"
23. [v]  make a certain noise or sound; "She went `Mmmmm'"; "The gun went `bang'"
24. [v]  cause to sound; "sound the bell"; "sound a certain note"
25. [v]  announce by means of a sound; "sound the alarm"

1. \Sound\, n. [AS. sund a swimming, akin to E. swim. See
   {Swim}.]
   The air bladder of a fish; as, cod sounds are an esteemed
   article of food.
   

2. \Sound\, n. (Zo["o]l.)
   A cuttlefish. [Obs.] --Ainsworth.
   

3. \Sound\, a. [Compar. {Sounder}; superl. {Soundest}.] [OE.
   sound, AS. sund; akin to D. gezond, G. gesund, OHG. gisunt,
   Dan. & Sw. sund, and perhaps to L. sanus. Cf. {Sane}.]
   1. Whole; unbroken; unharmed; free from flaw, defect, or
      decay; perfect of the kind; as, sound timber; sound fruit;
      a sound tooth; a sound ship.
   2. Healthy; not diseased; not being in a morbid state; --
      said of body or mind; as, a sound body; a sound
      constitution; a sound understanding.
   3. Firm; strong; safe.
            The brasswork here, how rich it is in beams, And
            how, besides, it makes the whole house sound.
                                                  --Chapman.
   4. Free from error; correct; right; honest; true; faithful;
      orthodox; -- said of persons; as, a sound lawyer; a sound
      thinker.
            Do not I know you a favorer Of this new seat? Ye are
            nor sound.                            --Shak.
   5. Founded in truth or right; supported by justice; not to be
      overthrown on refuted; not fallacious; as, sound argument
      or reasoning; a sound objection; sound doctrine; sound
      principles.
            Hold fast the form of sound words, which thou hast
            heard of me.                          --2 Tim. i.
                                                  13.
   6. heavy; laid on with force; as, a sound beating.
   7. Undisturbed; deep; profound; as, sound sleep.
   8. Founded in law; legal; valid; not defective; as, a sound
      title to land.
   Note: Sound is sometimes used in the formation of
         self-explaining compounds; as, sound-headed,
         sound-hearted, sound-timbered, etc.
   {Sound currency} (Com.), a currency whose actual value is the
      same as its nominal value; a currency which does not
      deteriorate or depreciate or fluctuate in comparision with
      the standard of values.
   

4. \Sound\, adv.
   Soundly.
         So sound he slept that naught might him awake.
                                                  --Spenser.
   

5. \Sound\, n. [AS. sund a narrow sea or strait; akin to
   Icel., Sw., Dan. & G. sund, probably so named because it
   could be swum across. See {Swim}.] (Geog.)
   A narrow passage of water, or a strait between the mainland
   and an island; also, a strait connecting two seas, or
   connecting a sea or lake with the ocean; as, the Sound
   between the Baltic and the german Ocean; Long Island Sound.
         The Sound of Denmark, where ships pay toll. --Camden.
   {Sound dues}, tolls formerly imposed by Denmark on vessels
      passing through the Baltic Sound.
   

6. \Sound\, v. t. [imp. & p. p. {Sounded}; p. pr. & vb. n.
   {Sounding}.] [F. sonder; cf. AS. sundgyrd a sounding rod,
   sundline a sounding line (see {Sound} a narrow passage of
   water).]
   1. To measure the depth of; to fathom; especially, to
      ascertain the depth of by means of a line and plummet.
   2. Fig.: To ascertain, or try to ascertain, the thoughts,
      motives, and purposes of (a person); to examine; to try;
      to test; to probe.
            I was in jest, And by that offer meant to sound your
            breast.                               --Dryden.
            I've sounded my Numidians man by man. --Addison.
   3. (Med.) To explore, as the bladder or urethra, with a
      sound; to examine with a sound; also, to examine by
      auscultation or percussion; as, to sound a patient.
   

7. \Sound\, v. i.
   To ascertain the depth of water with a sounding line or other
   device.
         I sound as a shipman soundeth in the sea with his
         plummet to know the depth of sea.        --Palsgrave.
   

8. \Sound\, n. [F. sonde. See {Sound} to fathom.] (Med.)
   Any elongated instrument or probe, usually metallic, by which
   cavities of the body are sounded or explored, especially the
   bladder for stone, or the urethra for a stricture.
   

9. \Sound\, n. [OE. soun, OF. son, sun, F. son, fr. L. sonus
   akin to Skr. svana sound, svan to sound, and perh. to E.
   swan. Cf. {Assonant}, {Consonant}, {Person}, {Sonata},
   {Sonnet}, {Sonorous}, {Swan}.]
   1. The peceived object occasioned by the impulse or vibration
      of a material substance affecting the ear; a sensation or
      perception of the mind received through the ear, and
      produced by the impulse or vibration of the air or other
      medium with which the ear is in contact; the effect of an
      impression made on the organs of hearing by an impulse or
      vibration of the air caused by a collision of bodies, or
      by other means; noise; report; as, the sound of a drum;
      the sound of the human voice; a horrid sound; a charming
      sound; a sharp, high, or shrill sound.
            The warlike sound Of trumpets loud and clarions.
                                                  --Milton.
   2. The occasion of sound; the impulse or vibration which
      would occasion sound to a percipient if present with
      unimpaired; hence, the theory of vibrations in elastic
      media such cause sound; as, a treatise on sound.
   Note: In this sense, sounds are spoken of as audible and
         inaudible.
   3. Noise without signification; empty noise; noise and
      nothing else.
            Sense and not sound . . . must be the principle.
                                                  --Locke.
   {Sound boarding}, boards for holding pugging, placed in
      partitions of under floors in order to deaden sounds.
   {Sound bow}, in a series of transverse sections of a bell,
      that segment against which the clapper strikes, being the
      part which is most efficacious in producing the sound. See
      Illust. of {Bell}.
   {Sound post}. (Mus.) See {Sounding post}, under {Sounding}.
   

10. \Sound\, v. i. [OE. sounen, sownen, OF. soner, suner, F.
    sonner, from L. sonare. See {Sound} a noise.]
    1. To make a noise; to utter a voice; to make an impulse of
       the air that shall strike the organs of hearing with a
       perceptible effect. ``And first taught speaking trumpets
       how to sound.'' --Dryden.
             How silver-sweet sound lovers' tongues! --Shak.
    2. To be conveyed in sound; to be spread or published; to
       convey intelligence by sound.
             From you sounded out the word of the Lord. --1
                                                   Thess. i. 8.
    3. To make or convey a certain impression, or to have a
       certain import, when heard; hence, to seem; to appear; as,
       this reproof sounds harsh; the story sounds like an
       invention.
             Good sir, why do you start, and seem to fear Things
             that do sound so fair?                --Shak.
    {To sound in} or {into}, to tend to; to partake of the nature
       of; to be consonant with. [Obs., except in the phrase To
       sound in damages, below.]
             Soun[d]ing in moral virtue was his speech.
                                                   --Chaucer.
    {To sound in damages} (Law), to have the essential quality of
       damages. This is said of an action brought, not for the
       recovery of a specific thing, as replevin, etc., but for
       damages only, as trespass, and the like.
    

11. \Sound\, v. t.
    1. To causse to make a noise; to play on; as, to sound a
       trumpet or a horn.
             A bagpipe well could he play and soun[d]. --Chaucer.
    2. To cause to exit as a sound; as, to sound a note with the
       voice, or on an instrument.
    3. To order, direct, indicate, or proclain by a sound, or
       sounds; to give a signal for by a certain sound; as, to
       sound a retreat; to sound a parley.
             The clock sounded the hour of noon.   --G. H. Lewes.
    4. To celebrate or honor by sounds; to cause to be reported;
       to publish or proclaim; as, to sound the praises of fame
       of a great man or a great exploit.
    5. To examine the condition of (anything) by causing the same
       to emit sounds and noting their character; as, to sound a
       piece of timber; to sound a vase; to sound the lungs of a
       patient.
    6. To signify; to import; to denote. [Obs.] --Milton.
             Soun[d]ing alway the increase of his winning.
                                                   --Chaucer.
    

1. audio.

2. An inference system A is sound with respect to another system B if A can only reach conclusions which are true in B. A type inference system is considered sound with respect to a semantics if the type inferred for an expression is the same as the type inferred for the meaning of that expression under the semantics.

The dual to soundness is completeness.