developmental

Concise Oxford English Dictionary © 2008 Oxford University Press:
development/dɪˈveləpmənt/

▶noun

• 1 the process of developing or being developed.

  ■ a specified state of growth or advancement.

• 2 a new product or idea.

• 3 an event constituting a new stage in a changing situation.

• 4 an area of land with new buildings on it: a major housing development.

– derivatives
developmental adjective,
developmentally adverb.