transient


transient (http://definr.com/transient)

     adj 1: (philosophy) of a mental act; causing effects outside the
            mind [syn: transeunt] [ant: immanent]
     2: enduring a very short time; "the ephemeral joys of
        childhood"; "a passing fancy"; "youth's transient beauty";
        "love is transitory but at is eternal"; "fugacious
        blossoms" [syn: ephemeral, passing, short-lived, transitory,
         fugacious]
     n 1: one who stays for only a short time; "transient laborers"
     2: (physics) a short-lived oscillation in a system caused by a
        sudden change of voltage or current or load