The floor of a building at or nearest ground level.
Informal The beginning of a venture, especially regarded as a position of advantage: investors vying to get in on the ground floor of a development project.
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.