অর্থ : The quality of being fixed in place as by some firm attachment.
সমার্থক : fastness, fixedness, fixture, secureness
The quality of movability by virtue of being free from attachment or other restraints.
loosenessঅর্থ : The quality of being incapable of mutation.
							উদাহরণ : 
							Darwin challenged the fixity of species.
							
সমার্থক : immutability, immutableness