Glossary of trampolining terminology:
 

Arabian Front	Early 1/2 Twist into a Front Somersault
Baby Fliffus	1 1/4 forward rotation from back with an early 1/2 twist to feet
Back to back	1 1/4 back somersault to back drop landing
Ball out	1 1/4 front somersault from back landing to feet
Barani Ball out	1 1/4 forward rotation from back landing plus 1/2 twist in the end phase
Bounce roll	Complete (360°) forwards somersault from back to back landing
Cat twist	back drop, full twist to back drop
Cody	1 1/4 rotation from front landing to feet (usually backwards)
Corkscrew	1 1/2 twist + 1/2 front somersault from back landing to back landing
Crash Dive	3/4 front somersault in the straight position from feet to back landing
Extension	The action of stretching out from a somersault
lazy back	3/4 back somersault from feet to front landing
Roller	Seat drop, full twist to Seat drop.
Mechanical terminology:
Centre of Mass	The point through which the line of force of gravity acts.  This need not lie within the physical limits of the body.  It is altered by every movement of the body.  The path of the Centre of Mass in flight is pre-determined at take-off.  Only an external force can change the path.  No actions of the body in flight can produce additional or less height or distance.  In flight the body shape can be altered and this will affect the speed of any rotation about an axis but does not alter the flight path of the Centre of Mass.
Velocity	Speed
Force	A PUSH or PULL.  A force is needed for: starting motion, changing the rate of motion, changing the directions of motion, or causing motion to stop.
Eccentric (off-centre) Force	A force whose line of action does not pass through the Centre of Mass of the body on which it acts.
Momentum	The "quantity" of motion ( Velocity x Mass)
Linear Momentum	Momentum in a straight line
Angular Momentum	The "quantity" of rotational motion (Angular Velocity x Moment of Inertia), i.e. speed of rotation x resistance to rotation.
Moment of Inertia	The body's resistance to change in its angular motion (rotation).  (Mass x Radius²)
Law of Conservation of Momentum	When in flight the total angular momentum can not be altered.
Transfer of Momentum	Any part of the body can acquire momentum, whilst in contact with the bed, which can be transferred to the whole body by a deliberate "blocking" action while in contact with the bed, or when losing contact with the bed.
Newton's First Law of Motion (Law of Inertia)	"A body will remain at rest or uniform motion unless acted upon by an external force". Inertia is the reluctance of a body to change its state of rest or uniform velocity. Inertia is measured by MASS and is the resistance to movement or change to movement, i.e. to begin moving, change the rate of movement or stop movement.  The greater the mass, the greater the resistance to change, therefore the greater the force required to make a change.
Newton's Second Law of Motion	The rate of change of velocity is proportional to the applied force, or the acceleration is directly proportional to the force.
Newton's Third Law of Motion	For every ACTION there is an equal and opposite REACTION.

Add One (Tag)

A game where someone does a move, someone repeats that and adds one, etc.

Adolph	A front somersault with 3 1/2 twists
Airplane	Another name for 1/2 twist to front drop
Baby Fliffus	A move starting on the back, and early half twist and over into back somersault
Back-in Full-out	Double somersault with a full twist during the second somersault.
Back pullover	Starting from a back drop, a 3/4 back somersault to feet
Ball out	A 1 1/4 front somersault starting from a back drop
Ball out barani	The same as a ball out, but with a late half twist
Ball out half out	Starting from a back drop, 2 1/4 front somersaults with a late 1/2 twist during the second somersault.
Ball out Adolph	The same as a ball out, but with 3 1/2 twists
Ball out randy	The same as a ball out, but with 2 1/2 twists
Ball out rudy	The same as a ball out, but with 1 1/2 twists
Barani	A front somersault with 1/2 twist, can be tucked, piked or straight
Back in Half out	A double front somersault with a 1/2 twist during the first somersault, making the second one have a back landing.
Barani out	another name for a half out, a double front somersault with a 1/2 twist during the second somersault.
Barrel Roll	A front drop, full twist horizontally to front drop.
Bounce Roll	A move starting on the back, a complete front somersault landing in a back drop, ready to repeat and see how many you can get!
Cast	Moving left or right towards the edge of the trampoline during a move
Cat Twist	Back drop full twist to back drop
Cody	Starting from a front drop, 1 1/4 back somersault
Compulsory	The routine that must be performed at a competition.
Corkscrew	Back drop, 1 1/2 twist to back drop
Cradle	Back drop 1/2 twist to backdrop
Crash Dive	3/4 front somersault, straight
Crash Mat	The thickest mats that are usually put on the end decks.
De-synchronisation	When doing synchro, the amount the two people are out of sync with each other
Dorso-Ventral Axis	The axis travelling through the navel and lower back, the axis on which turntables and side somersaults are performed. There are no marks awarded for this in competitions.
Double Back	A double back somersault
Double Bounce	As a bounce roll, but with 2 somersaults instead of 1
Double Full	A single somersault, with a double twist.
End Deck (The red pad, lol)	Also called spotting boards, a large platform secured to the shorter ends of the trampoline to catch you when you go wrong.
Execution	Executing a routine, or the style and technique used to complete the routine.
F.I.G	Federation Internationale Gymnastique, the governing body for international gymnastics and trampolining competitions.
Forward turnover	3/4 front somersault, usually a build up for a somersault or crash dive.
Full	Full twisting straight back somersault
Full in Back out	A double back somersault, with a full twist in the first somersault
Full Twist Jump	A 360 degree twist, turning all the way round
Gain	moving in the opposite direction of the skill you are performing. opposite of travelling
Half Twist jump	Turning to face the other way
Kaboom	Somersault from Front or Back, where a double contact is made, this reverses the rotation that was already present.
Kick Out	After the somersault has been executed, kicking the legs straight and straightening the body ready for the next skill.
Killer	A double back somersault with 4 complete twists.
Kip	A technique used to control, (increase or decrease) the rebound of the performer.
Layout	A straight body position
Lateral Axis	The axis that runs through the hips, somersaults run through this axis.
Lazy Back	A 3/4 straight back somersault
Line out	After the skill has been executed, placing the arms by the side of the body and preparing for the next skill.
Lost Move Syndrome   (LMS)	Where a skill could be performed accurately, but suiddenyl it cannot be performed again due to mental block.
Miller	A triple twisting straight back somersault.
Overhead rig (The Harness)	Overhead apparatus to support performers learning a new move.
Pike	Where the legs are out straight in front of you, and you touch your toes.
Planterflexion	the technical term for point your toes
Puck	A semi tucked shape allowed in competitions for multiple twisting multiple somersaults.
Quadriffis	Any quadruple somersault combined with any number of twists.
Randy	A single front somersault with 2 1/2 twists, also called a Rudolph.
Roller	Seat drop, full twist (with the body horizontal) to seat drop.
Rudy	A single front somersault with 1 1/2 twists, also called a Rudolph.
Straddle	With the legs out in front, at least shoulder width apart, and at least a 45 degree angle between the upper and lower body.
Swivel Hips	Seat drop half twist to seat drop
Synchronised trampolining	two people on separate trampolines, executing the same routine at the same time.
Tariff	The amount of difficulty given for each element of a routine.
Tilt Twist	A mechanical phenomenon where rotation is borrowed and turned into twist.
Travel	Where a performer moves along the trampoline in the direction of the skill being performed. For eg. moving forward along the trampoline whilst doing a front drop.
Triff	Any triple somersault with any component os twist.
Tuck	Where the knees are bought into the chest, and you tuck tight in a ball
Turntable	A move that starts on the front, and then moves around the dorso ventral axis, landing on the front again.