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

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

(ice hockey) The ice between a team's own blue line and its end board.

(computing) The practice of planning for contingencies in the design stage of a project so as to make the misuse of the software impossible, or to minimise the negative consequences.

(programming) A form of defensive design aiming to ensure the continuing functioning of a piece of software in spite of unforeseeable usage of it.

plural of defensive design

(video games) A style of real-time strategy video game in which the player attempts to stop enemies from crossing a map by building traps to slow them down and towers or turrets which shoot at them as they pass within range.

Efforts to protect the citizens of a state from military attack.

(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.