1. to find out or establish exactly by research or calculation
2. to decide or settle conclusively
3. to cause something to happen in a particular way or have a particular result

Examples

• Scientists are working to determine the cause of the disease.
• The test results will determine whether you pass the course.
• Weather conditions determine when we can plant the crops.
• She determined to finish the project by Friday.
• The jury will determine the defendant's guilt or innocence.
• Your attitude determines your success in life.
• We need to determine the exact cost before proceeding.