An Etymological Dictionary of Astronomy and Astrophysics

1. The act, process, or result of developing. The state of being developed.
   

2a) Math.: The act or process of → expanding an expression into another of equivalent value or meaning.

2b) The equivalent expression into which another has been developed.

Etymology (EN): From → develop + -ment suffix forming nouns from verbs.

Etymology (PE): Govâleš, from govâl, stem of govâlidan, → develop, + -eš verbal noun suffix, → -tion.