English
facultativeness
From facultative + -ness.
Formed from facultative + -ness
Proto-Italic *fakelitāts
Latin facultas ‘ability to do any thing easily, skill,…’
French facultatif ‘optional, elective’
English facultative
Today it means
noun The state or quality of being facultative.
Language periods are conventional ranges, not dates for this word.
Etymograph / facultativeness