How to say "to determine, to define" in Russian?

Определить

"to determine, to define" is Определить in Russian.

Определить means "to determine, to define" in English.

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Word #1479 of 4,000 by frequency in Russian — level B1.

Example

Врач должен определить причину болезни быстро.

The doctor must determine the cause of the illness quickly.