early 14c., condicioun, from Old French condicion "stipulation, state, behavior, social status" (12c., Modern French condition), from Latin condicionem (nominative condicio) "agreement, situation," from condicere "to speak with, talk together," from com- "together" (see com-) + dicere "to speak" (from PIE root *deik- "to show," also "pronounce solemnly"). Evolution of meaning through "stipulation, condition," to "situation, mode of being."
late 15c., "to make conditions," from condition (n.). Meaning "to bring to a desired condition" is from 1844. Related: Conditioned; conditioning.
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