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preconceptual stage

(prē′kən-sĕpchōō-əl)
n.
  1. The stage of development in an infant's life in which sensorimotor activity predominates.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.