Defence-Defense | Commonly Confused Words

Defence

/dɪˈfens/

The act of protecting or resisting an attack or danger

He has the choice of various defences.'Well now,' President Muffley said, 'civil defence...'Now Sir Ernest spoke in John's defence.

/dɪˈfens/

Protection or resistance against attack or harm

Defence is the preferred spelling in British English, while defense is used in American English.
Both words have the same pronunciation and meaning, related to protecting or defending against something.
Remember, defenCe with a C for Centre (British spelling).
DefenSe with an S for Stars and Stripes (American spelling).
Think of defenSe like offenSe, both spelt with S in American English.