A child of one's spouse by a previous union.
Something that does not receive appropriate care, respect, or attention: "Demography has a reputation for being the stepchild of . . . economics” ( Louis Pol).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.