[n] (physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load
[n] one who stays for only a short time; "transient laborers"
[adj] (philosophy) of a mental act; causing effects outside the mind
[adj] 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"