transient

Adjective
  1. Of a mental act;
    Causing effects outside the mind (synset 301277235)
  2. Lasting a very short time (synset 301760804)
    "the ephemeral joys of childhood"; "a passing fancy"; "youth's transient beauty"; "love is transitory but it is eternal"; "fugacious blossoms"
Noun
  1. One who stays for only a short time (synset 110744785)
    "transient laborers"
  2. (physics) a short-lived oscillation in a system caused by a sudden change of voltage or current or load (synset 107362068)

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