1. areas of undeveloped land, typically countryside or agricultural areas, that have not been built on or industrialized
Usage: usually plural; chiefly British; used in urban planning and environmental contexts
2. a new business venture or project started from scratch, without existing infrastructure or operations
Usage: usually plural; business and technology contexts

Examples

• The city council voted to protect greenfields from commercial development.
• Developers want to build housing on the greenfields surrounding the town.
• Environmental groups oppose the destruction of greenfields for industrial parks.
• The company is investing in greenfields projects in emerging markets.
• Our greenfields initiative aims to launch three new product lines this year.
• Building on greenfields is often cheaper than redeveloping brownfields.