constancy

 
Pronunciation: /ˈkɒnst(ə)nsi/

noun

[mass noun]
  • the quality of being faithful and dependable: she did not think much of married bliss, yet she approved of constancy
  • the quality of being enduring and unchanging: the constancy of the tradition

Origin:

late 15th century: from Latin constantia, from constant- 'standing firm' (see constant)