- A turning or changing to the opposite direction, as of a process, disease, symptom, or state.
- The changing of a dark line or a bright one of the spectrum into its opposite.
- Denoting the difficulty of some people in distinguishing the lowercase printed or written letter p from q or g, b from d, or s from z.
- In psychoanalysis, the change of an instinct or affect into its opposite, as from love into hate.
[L. reverto, pp. -versus, to turn back or about]
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Examples: glitazone, GI cocktail, etc.