Ek dhvani ek aisi alag alag awaaz hai jo bhasha mein arth ka bhed karta hai. Udaan (udan) aur udhan (udhan) mein "a" aur "a" alag alag dhvani hai jo dono shabd ke arth mein fark laate hain.
Ek dhvani ek alag alag swar ya vyanjan ho sakta hai, aur ek alag alag dhvani ki alag alag shabd mein alag alag pronunciation bhi ho sakta hai.
Udaan aur udhan mein "a" ki pronunciation alag alag hai, par dono dhvani mein "a" ek hi hai.