Defence meaning

dĭ-fĕns'
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The action of defending, of protecting from attack, danger or injury.
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Something used to oppose attack(s).
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An argument in support or justification of something.
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Defence, the British spelling of defense, is defined as a protection against attack or the act of guarding, or an action that is taken in response to an attack.

A moat protecting your castle is an example of the first line of defence.

When someone attacks your actions and decisions and says you did everything wrong, the way in which you argue that this is not true is an example of a defence of your actions.

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(team sports) A strategy and tactics employed to prevent the other team from scoring; contrasted with offense.
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(team sports) The portion of a team dedicated to preventing the other team from scoring; contrasted with offense.
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Government policy or (infra)structure related to the military.

Department of Defense.

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(obsolete) To furnish with defences; to fortify.
verb
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Origin of defence

From French défense, from Latin defensa (“protection”).