- a branch of psychology that studies changes in human behavior from early life to death.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- The branch of psychology concerned with the study of behavioral changes in an individual from birth until death.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
The branch of psychology that studies the psychological growth of individuals. It deals with the psychological responses and changes in behavior that characterize such stages of life as infancy, adolescence, and old age.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.