演习 yǎnxí (verb and noun) drill
(military, firefighting etc) (verb and noun) drill; exercise; maneuver
How to remember 演习: 演 perform + 习 practice = (verb and noun) drill.
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How it is used
- A rehearsed large-scale drill or maneuver, especially military or emergency - 军事演习 (jūnshì yǎnxí) military exercise; 消防演习 fire drill.
- Both noun and verb. Contrast 演练 (yǎnliàn), which is more about practising a specific skill or procedure repeatedly.
- Register: formal/organizational; you don't 演习 a personal task, you 演习 a coordinated operation.