developer

Concise Oxford English Dictionary © 2008 Oxford University Press:
develop/dɪˈveləp/

▶verb (develops, developing, developed)

• 1 grow or cause to grow and become larger or more advanced.

• 2 convert (land) to a new purpose, especially by constructing buildings.

• 3 start to exist, experience, or possess: I developed an interest in law.

• 4 treat (a photographic film) with chemicals to make a visible image.

• 5 Chess bring (a piece) into play from its initial position on a player's back rank.

– derivatives
developable adjective,
developer noun.

– origin C17 (in the sense ‘unfold, unfurl’): from Fr. développer, based on L. dis- ‘un-’ + a second element of unknown origin found also in envelop.