n.
A sudden, large, sustained increase in the birthrate, especially the one in the United States and Canada from the later 1940s through the early 1960s.
baby-boom ba'by-boom' (bā'bē-būm') adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.