/ ˈkɒnstənsi; NAmE ˈkɑːn-/ noun [ U ] ( formal )
1.
the quality of staying the same and not changing
2.
( approving ) the quality of being faithful
SYN fidelity :
He admired her courage and constancy.
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WORD ORIGIN
late 15th cent.: from Latin constantia , from constant- standing firm, from the verb constare , from con- with + stare stand.