WordNet sense 1 (decide upon or fix definitely):

fix, limit, set, specify

WordNet sense 2 (find out, learn, or determine with certainty, usually by making an inquiry or other effort):

ascertain, check, learn, see, watch, find out

WordNet sense 3 (establish after a calculation, investigation, experiment, survey, or study):

find

WordNet sense 4 (settle conclusively; come to terms):

settle, square up, square off

WordNet sense 5 (shape or influence; give direction to):

influence, mold, regulate, shape, shape

WordNet sense 6 (reach, make, or come to a decision about something):

decide, make up one's mind