the quality of staying the same and not changing 稳定性；持久不变；始终如一 the constancy of temperature inside the plane 飞机内部温度的稳定性
- (approving)
the quality of being faithful 忠诚；忠实；忠贞
Word Originlate 15th cent.: from Latin constantia, from constant- ‘standing firm’, from the verb constare, from con- ‘with’ + stare ‘stand’.