(military) Forms of defense that offer protection without counterattacking.

(informal) A legal defense strategy in which the defendant categorically denies any involvement.

Any defensive measure against an attack by missiles etc while in space

The means of defending oneself from physical attack.

(basketball, soccer) A defense in which each player covers an area of the court.

(law, humorous) Any legal strategy or propaganda strategy that seeks to overwhelm its audience with nonsensical arguments, as a way of confusing the audience and drowning out legitimate opposing arguments.

All the methods and procedures involved in defending against attack by chemical agents.

(law) A plea to the effect that from some formal defect (e.g. misnomer, lack of jurisdiction) the proceedings should be abated.

(academy) The final step in earning a doctorate: an oral examination in which the doctorand publicly defends his/her thesis to the examiners.

(US, law) A legal defense in which the defendant claims to have committed a crime in the belief that he/she was not in the real world, but in a simulated reality.