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1. Literally, having been kept from decaying over a long period of time. The ancient body found in the cave was miraculously well preserved. Researchers have indicated that any well preserved DNA of ancient animals could be used to bring them back to life through cloning techniques.
2. Not showing the usual effects of one's age. I must figure out his secret because, for a 70-year-old, he's remarkably well preserved.
Aging gracefully, still in good condition, as in I can't believe she's 65; she's certainly well preserved. [Mid-1800s]