|1.||to disappear, esp suddenly or mysteriously|
|2.||to cease to exist; fade away|
|3.||maths to become zero|
|4.||rare phonetics the second and weaker of the two vowels in a falling diphthong|
|[C14: vanissen, from Old French esvanir, from Latin ēvānēscere to evaporate, from ē-|
see under into thin air.