测定 cèdìng to determine (by measuring or surveying)
How to remember 测定: 测 to survey + 定 decide = to determine (by measuring or surveying).
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How it is used
- A technical 'to determine/measure precisely' - 测定含量 (cèdìng hánliàng) to determine the content/concentration.
- Scientific register: measuring a value through instruments or surveying - 测定年代 (dating by measurement).
- More formal than 测量 (cèliáng, to measure dimensions); 测定 stresses arriving at a determined value.