'Transiently' definitions:

Definition of 'transiently'

adverb

For a very short time; "these three pions may actually be joined together transiently as a compound particle during the interchange process"

From: GCIDE

Transient \Tran"sient\, a. [L. transiens, -entis, p. pr. of transire, transitum, to go or pass over. See Trance.]
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. [1913 Webster]
2. Hasty; momentary; imperfect; brief; as, a transient view of a landscape. [1913 Webster]
3. Staying for a short time; not regular or permanent; as, a transient guest; transient boarders. [Colloq. U. S.] [1913 Webster]
Syn: Transient, Transitory, Fleeting.
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. [1913 Webster]
What is loose love? A transient gust. --Pope [1913 Webster]
If [we love] transitory things, which soon decay, Age must be loveliest at the latest day. --Donne. [1913 Webster]
O fleeting joys Of Paradise, dear bought with lasting woes. --Milton. [1913 Webster] -- {Tran"sient*ly}, adv. -- {Tran"sient*ness}, n. [1913 Webster]