One of the mysteries of the English language finally explained.
Recovery from illness; recuperation; convalescence; an instance of this.
Early 19th century; earliest use found in Samuel Taylor Coleridge (1772–1834), poet, critic, and philosopher. From classical Latin revalēscere to regain one's strength, get well again, (of consciousness) to revive (from re- + valēscere to become sound in health from valēre + -ēscere: see -escent) + -ence, probably after convalescence, reconvalescence. Compare post-classical Latin revalescentia.
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