'self-propelled' definitions:

Definition of 'self-propelled'

(from WordNet)
adjective
Containing within itself the means of propulsion or movement; "a self-propelled vehicle" [syn: automotive, self-propelled, self-propelling]
adjective
Moved forward by its own force or momentum; "a self-propelled egotist"; "the arms program is now self-propelled" [syn: self-propelled, self-propelling]