From The Collaborative International Dictionary of English v.0.44 [gcide]:
1. Passing before the sight or perception, or, as it were, moving over or across a space or scene viewed, and then disappearing; hence, of short duration; not permanent; not lasting or durable; not stationary; passing; fleeting; brief; transitory; as, transient pleasure. ''Measured this transient world.'' --Milton.
Usage: Transient represents a thing as brief at the best; transitory, as liable at any moment to pass away. Fleeting goes further, and represents it as in the act of taking its flight. Life is transient; its joys are transitory; its hours are fleeting.
From WordNet (r) 2.0 [wn]:
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