development āļāļ·āļāļāļ°āđāļĢ development āļāļ·āļāļāļ°āđāļĢ 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.