an impermanence that suggests the inevitability of ending or dying
<noun.attribute>
the attribute of being brief or fleeting
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Transience \Tran"sience\, Transiency \Tran"sien*cy\, n. The quality of being transient; transientness.
It is a serene, even a joyous, occasion when the living are reunited with the spirits of their dead relatives, while contemplating the transience of their own existence. No effort is spared to welcome the returning spirits.