The act of developing or the state of being developed, as: The application of techniques or technology to the production of new goods or services. The business of constructing buildings or otherwise altering land for new uses. A significant event, occurrence, or change: a news story covering the latest developments in the scandal. A group of dwellings built by the same contractor: bought a condo in a new development built by the river. The organized activity of soliciting donations or grants; fundraising. Music Elaboration of a theme with rhythmic and harmonic variations. The central section of a movement in sonata form, in which the theme is elaborated and explored.