(p. 47) aparibartana absence or lack of change or alteration or modification; constancy; fixity; firmness. অপরিবর্তনীয় a. unchangeable, unalterable, immutable, invariable; unchanging; constant; fixed; firm. অপরিবর্তনীয়তা n. unchangeability, immutability; unchanging state; constancy; fixity; firmness. 9)