kehitysajan
Kehitysajan is a Finnish term that denotes the development period or development time. It is not a standalone concept but a genitive form used with nouns such as kehitysaika or kehitysjakso to indicate association with a period of development.
In usage, kehitysajan appears in scientific, technical, and everyday Finnish to describe the duration or timing
Etymology and grammar: the word combines kehitys (development) with aika (time/period), and the genitive form "-ajan"