Yes, determine is a Scrabble word!

Verb

1. Establish after a calculation, investigation, experiment, survey, or study

2. Shape or influence; give direction to

3. Fix conclusively or authoritatively

4. Decide upon or fix definitely

5. Reach, make, or come to a decision about something

6. Fix in scope; fix the boundaries of

7. Settle conclusively; come to terms

8. Find out, learn, or determine with certainty, usually by making an inquiry or other effort