'azureness' originates from 'Old French', specifically the word 'azur', where 'azur' ultimately comes from Arabic 'lazaward' (via Medieval Latin 'lazulum') referring to the semi-precious stone lapis lazuli.

'azur' (Old French) changed from Arabic 'lazaward' (through Medieval Latin 'lazulum'/'lapis lazuli') and eventually became the Middle English and modern English adjective 'azure'; the noun formation 'azureness' derives from that adjective.

Initially, the root referred to the stone 'lapis lazuli' or its deep blue color; over time it shifted to mean the color blue itself and now 'azureness' denotes the quality or state of being blue/azure.