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WordReference Random House Unabridged Dictionary of American English © 2016
de•vel•op•ment  (di veləp mənt), 
  1. the act or process of developing;
    progress:child development; economic development.
  2. a significant consequence or event:recent developments in the field of science.
  3. a developed state or form:Drama reached its highest development in the plays of Shakespeare.
  4. Music and Dance[Music.]the part of a movement or composition in which a theme or themes are developed.
  5. Businessa large group of private houses or of apartment houses, often of similar design, constructed as a unified community, esp. by a real-estate developer or government organization.
  6. [Chess.]the act or process of developing chess pieces.
  7. Mining[Mining.]the work of digging openings, as tunnels, raises, and winzes, to give access to new workings, and of erecting necessary structures.
  • French développement
  • develop + -ment, or 1745–55
de•vel′op•mental, de•vel′op•menta•ry, adj. 
de•vel′op•mental•ly, adv. 
1 . expansion, elaboration, growth, evolution;
unfolding, opening, maturing, maturation. 3 . maturity, ripeness. 5 . community, subdivision.
1 . deterioration, disintegration.
WordReference Random House Learner's Dictionary of American English © 2016
de•vel•op /dɪˈvɛləp/USA pronunciation   v. 
  1. to bring out the possibilities (of);
    come or bring to a more advanced state: [no object]Her reading skills were developing at a rapid pace.[+ object]new plans to develop natural resources.
  2. to (cause to) grow or expand: [no object]Your biceps will develop quickly with that exercise.[+ object]exercises to develop your biceps.
  3. to bring into being or activity; produce[+ object]to develop new techniques.
  4. to (cause to) come into an active state, such as by natural growth or internal processes: [no object]Cancer developed rapidly in the lab mice.[+ object]He had begun to develop an allergy.
  5. to elaborate or expand in detail; show in detail[+ object]began to gather facts to develop his theory.
  6. to build on or improve (a piece of land), esp. so as to make more profitable[+ object]The builders are developing that part of town.
  7. to be made visible, clear, or easy to see; become manifest: [no object]The plot develops slowly.[It + ~ + that clause]It developed that my client had an alibi for that night.
  8. Photographyto immerse (film) in chemicals so that an image becomes visible: [no object]With this instant film, the picture develops in only one minute.[+ object]How long will it take to develop these pictures?
de•vel•op•ment, n. [countable]Developments were proceeding so fast he could no longer keep up.[uncountable]the development of nuclear weapons.
develop is a verb, development is a noun, developing and developed are adjectives:Learners want to develop good language skills. Their development was very slow. Developing countries are poor; developed countries are rich.
WordReference Random House Unabridged Dictionary of American English © 2016
de•vel•op  (di veləp), 
  1. to bring out the capabilities or possibilities of;
    bring to a more advanced or effective state:to develop natural resources; to develop one's musical talent.
  2. to cause to grow or expand:to develop one's muscles.
  3. to elaborate or expand in detail:to develop a theory.
  4. to bring into being or activity; generate;
  5. [Drafting.]to transfer the details of (a more or less two-dimensional design, pattern, or the like) from one surface, esp. one that is prismatic or cylindrical, onto another, usually planar, in such a way that the distances between points remain the same.
  6. [Biol.]
      • to cause to go through the process of natural evolution from a previous and lower stage.
      • to cause to progress from an embryonic to an adult form.
  7. Mathematics[Math.]to express in an extended form, as in a series.
  8. Music and Dance[Music.]to unfold, by various technical means, the inherent possibilities of (a theme).
  9. [Photog.]
      • to render visible (the latent image on an exposed film or the like).
      • to treat (an exposed film or the like) with chemicals so as to render the latent image visible.
  10. Chess[Chess.]to bring (a piece) into effective play, esp. during the initial phase of a game when pieces are moved from their original position on the board:He developed his rook by castling.
  11. Mining[Mining.]to prepare (a new mine) for working by digging access openings and building necessary structures.

  1. to grow into a more mature or advanced state;
    expand:She is developing into a good reporter.
  2. to come gradually into existence or operation; be evolved.
  3. to be disclosed;
    become evident or manifest:The plot of the novel developed slowly.
  4. Photographyto undergo developing, as a photographic film.
    • to progress from an embryonic to an adult form.
    • to progress from earlier to later stages of ontogeny or phylogeny.
    • to reach sexual maturity.
  • Middle French développer, Old French desveloper, equivalent. to des- dis-1 + voloper to wrap up; see envelop
  • 1585–95
de•velop•a•ble adj. 
de•vel′op•a•bili•ty, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

development /dɪˈvɛləpmənt/ n
  1. the act or process of growing, progressing, or developing
  2. the product or result of developing
  3. a fact, event, or happening, esp one that changes a situation
  4. an area or tract of land that has been developed

  5. Also called: development section the section of a movement, usually in sonata form, in which the basic musical themes are developed
  6. the process of developing pieces

deˌvelopˈmental adj

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