'aquosity' originates from Latin, specifically the word 'aqua', where 'aqua' meant 'water', combined with the suffix '-osity' (from Latin '-ositas') meaning 'state or quality'.

'aquosity' developed from Late Latin 'aquositas' (formed from 'aquosus', 'watery') and passed into English formation patterns for abstract nouns (English '-osity'), resulting in the modern English word 'aquosity'.

Initially it meant 'the state or quality of being watery' in Late Latin, and over time it retained essentially the same meaning as the modern English 'aquosity' meaning 'wateriness'.