- the floor of a building at or nearest to ground level.
- Informal. an advantageous position or opportunity in a business matter, especially in a new enterprise: She took the job in the new company because she wanted to get in on the ground floor.
- the floor of a building level or almost level with the ground
- get in on the ground floor or start from the ground floor informal
- to enter a business, organization, etc, at the lowest level
- to be in a project, undertaking, etc, from its inception
also ground-floor, c.1600, from (n.) + (n.); figurative use is from 1864.