WordNet sense 1 (an examination administered at the end of an academic term):

final examination, final exam

WordNet sense 2 (conclusive in a process or progression):

last, net

WordNet sense 3 (furthest or highest in degree or order; utmost or extreme):

ultimate

WordNet sense 4 (occurring at or forming an end or termination):

concluding, terminal

WordNet sense 5 (not capable of being changed or altered):

unalterable, inalterable