developer

de•vel•op•er n.

[countable] a person or group of persons intending to build on or improve land so as to make a profit on it:greedy land developers.
a person whose skills are expanding:[countable]an early developer in reading.
a person bringing new products or techniques into being:[countable]Developers of the theory must now look elsewhere for data to confirm it.
a chemical used for developing photographic film: [uncountable]Pour more developer into the tank.[countable]Maybe we can buy a developer that doesn't smell so bad.

de•vel•op•er n.

a person or thing that develops.
Photographya reducing agent or solution for developing a film or the like.
Businessa person who invests in and develops the urban or suburban potentialities of real estate, esp. by subdividing the land into home sites and then building houses and selling them.
Nautical, Naval Terms[Shipbuilding.]a person who lays out at full size the lines of a vessel and prepares templates from them.

Collins Concise English Dictionary © HarperCollins Publishers::

developer /dɪˈvɛləpə/ n

a person or thing that develops something, esp a person who develops property
a solution of a chemical reducing agent that converts the latent image recorded in the emulsion of a film or paper into a visible image

'developer' also found in these entries (note: many are not synonyms or translations):

Collocations: a [software, program, video game] developer, a [land, property, housing] developer, works as a developer, more...

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