'apparentness' originates from Modern English, specifically the word 'apparent' plus the suffix '-ness', where 'apparent' came from Old French 'apparent' (from Latin 'apparēre') and the suffix '-ness' (from Old English) denoted a state or quality.

'apparent' derives from Latin 'apparēre' meaning 'to appear'; it passed into Old French as 'apparent' and into Middle English as 'apparent', and the modern noun 'apparentness' was formed in English by adding the derivational suffix '-ness' to express the state or quality of being apparent.

Initially related to the verb sense 'to appear' (Latin 'apparēre'), the root developed into an adjective 'apparent' meaning 'visible or obvious', and then into the noun 'apparentness' meaning 'the state or quality of being obvious or apparent'.