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Từ điển American Heritage Dictionary 4th
vital
vi·tal (vītʹl)adj. 1. Of, relating to, or characteristic of life: See Synonyms at living. 2. Necessary to the continuation of life; life-sustaining: a vital organ; vital nutrients. 3. Full of life; animated: “The population of the teeming, vital slum... declined” (Rick Hampson). 4. Imparting life or animation; invigorating: the sun's vital rays. 5. Necessary to continued existence or effectiveness; essential: “Irrigation was vital to early civilization” (William H. McNeill). “A vital component of any democracy is a free labor movement” (Bayard Rustin). 6. Concerned with or recording data pertinent to lives: vital records. 7. Biology. Used or done on a living cell or tissue: vital dyes; vital staining. 8. Destructive to life; fatal: a vital injury. [Middle English, from Old French, from Latin vītālis, from vīta, life. See gʷei- in Indo-European Roots.] viʹtal·ly adv.viʹtal·ness n.
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