Origin: Its first usage dates back to 1538 and has its roots in Latin word turbulentus, which has originated from the word turba, which means confusion.
1) Someone in a disturbed state of mind
2) Something that is characterized by disturbance and unrest .e.g. turbulent waves or turbulent period in time
3) Unruly .i.e. uncontrollable disturbances or uncontrollable crowds