Objectives	Specific wants which a character may have in a scene and/or play.
Obstacle	Element that prevents a direct path.
Octave	The guard and parry that closes the low outside line. The hand is supinated, with the point lower than the hand.
Off-line fencing	Any form of theatrical fencing which directs the point off target, avoiding actual body contact.
Offense	To be on the attack.
Offensive defence	Counter attack by means of a stop hit or cut.
Off stage	a/ The zone to the right and left of the visible stage area. b/ To move in the direction of the wings, to move off stage.
On guard	a/ (En guarde) The position of a combatant prior to attack, from which he can launch an attack or create a defensive movement. b/ to be in a state of readiness.
On line fencing	Theatrical swordplay where specific body areas are targeted, in order to avoid loss of balance, reality etc.
On the pass	To strike with a forward or outward step, to hit "on the pass". Gradually replaced by the lunge as time went on.
One, Parry	Defensive action guarding the left side of the face from attack. Referred to as one because it is the first position a combatant draws his sword to.
One, two	A form of compound attack which uses a first changement and threat to draw a parry then a second changement to direct the actual attack back in the original line of engagement.
On stage	a/ To be in the playing area. b/ To move in the direction of centre stage from the left or right.
Open eyes	The starting of a movement with no prior knowledge of how it will finish, relying on the reflexes to adjust and make the correct ending.
Open invitation	Opening of a line to attack in order to draw a response.
Open line	Target area  not covered by a guard position.
Opening	A hole in your opponents defences, deliberate or unintentional.
Opposition	Resistance to pressure. The term applied to hitting or defending from an engaged position.
Orthopedic grip	A weapon grip designed to fit exactly into a fencers hand. It allows a fencer to use the weapon longer without cramping and has (arguably) more blade control, than a straight grip.
OS	(Film) Off screen.
Out of distance	See distance, fencing measure etc.
Out of sequence	To rehearse or perform (as in film, TV) in a different order to that written down in the script.
Outside line	The weapon bearing half of the body as seen on one side of an imaginary vertical line. The parts of the target nearest to the attackers sword arm.
Outside mollinello	A mollinello executed on the weapon bearing side of the body.
Outside ward	Guard with the sword held back and down to the right.
Overhand grip	a/ Holding of the sword or dagger with the point above the hand. b/ Holding of any weapon in pronation.
Overload principle	When an athlete stresses an action more heavily than is required within the context of the sport, i.e. by increased repetition, weight or resistance in order to improve power or stamina.