1.Definition: evaporating readily at normal temperatures and pressures
"Volatile oils", "Volatile solvents"
2.Definition: liable to lead to sudden change or violence
"A volatile situation with troops and rioters eager for a confrontation"
3.Definition: marked by erratic changeableness in affections or attachments
"A flirt's volatile affections"
4.Definition: tending to vary often or widely
"Volatile stocks", "Volatile emotions"