1. （房地产）开发商，开发公司
A developer is a person or a company that buys land and builds houses, offices, shops, or factories on it, or buys existing buildings and makes them more modern.

2. (想法、设计、产品等的)开发者
A developer is someone who develops something such as an idea, a design, or a product.

3. 显影剂;显色剂
Developer is a chemical used for developing photographs or films.

1. photographic equipment consisting of a chemical solution for developing film

2. someone who develops real estate (especially someone who prepares a site for residential or commercial use)