English word plenitude comes from Middle French plenitude

Detailed word origin of plenitude

Dictionary entry	Language	Definition
plenitude	Middle French (frm)
plenitude	Anglo-Norman (xno)
plenitude	English (eng)	(heraldry) Fullness (of the moon). [from 19th c.]. An abundance; a full supply. [from 17th c.]. Fullness; completeness. [from 15th c.].

Words with the same origin as plenitude