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oral phase

n.
  1. In psychoanalytic theory, the first stage in psychosexual development, from birth to about 18 months, when the mouth is the focus of the infant's needs, expression, gratification, and pleasurable erotic experiences.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.