n. Success; a successful course; prosperity in doing something; good fortune; luck: used either absolutely or relatively: as, to wish one good speed in an undertaking.n. Apromoter of success or progress; a speeder.n. Rapidity of movement; quickness of motion; swiftness: also used figuratively.n. Rate of progress or motion (whether fast or slow); comparative rapidity; velocity: as, moderate speed; a fast or a slow rate of speed; to regulate the speed of machines.n. In submarine rock-drilling, a leg or beam to which the drilling apparatus is attached.n. Synonyms Swiftness, Rapidity, etc. (see quickness), expedition.To advance toward a goal or a result; get on successfully; be fortunate; prosper; get on in general; make progress; fare; succeed.To get on rapidly; move with celerity; hasten in going; go quickly; hasten in doing something; act rapidly; hurry; be quick.To cause to advance toward success; favor the course or cause of; make prosperous.To push forward; carry toward a conclusion; promote; advance.To send or push forward in a course; promote the going or progress of; cause to go; aid in going.To give high speed to; put to speed; hasten the going or progress of; make or cause to be rapid in movement; give celerity to: also used reflexively.To give a certain (specified) speed to; also, to regulate the speed of; arrange for a certain rate of going; set for a determined rapidity.To send off or away; put forth; despatch on a course: as, an arrow sped from the bow.Hence To send or put out of the way; get rid of; send off; do for; in a specific use, to send out of the world; put to death; despatch; kill.To cause to be relieved: only in the passive.To disclose; unfold; explain.n. Rapidity of action, as of a lens. The speed of a lens is dependent upon the amount of light it projects on the plate.n. In mech., a device by which the rate of motion may be changed or controlled, particularly in motor-vehicles.n. The speed at which a machine, vibration, or other periodic element synchronizes with another machine, vibration, or periodic element: for example, the synchronizing of the speed of a machine with the period of vibration of the building in which it is operated.n. A rate of travel or speed of revolution of the drivers of a locomotive or of a motor-car at which the rate of flow of steam, or motor fluid to the cylinder, is so retarded by friction in passages, or otherwise, that further increase of speed is not accompanied by increase of power. This may also occur because of diminished adhesion of the drivers to the rail or road surface at such high speed.