'balancedness' originates from English, specifically formed from the adjective 'balanced' plus the suffix '-ness' (from Old English '-nes(s)e'), where '-ness' meant 'state or quality'. The adjective 'balanced' itself comes from the verb 'balance'.

'balance' comes from Old French 'balance' (from Late Latin/Medieval Latin 'bilancia' or 'bilanx'), where Latin elements 'bi-' meant 'two' and 'lanx'/'lanc-' referred to a 'scale' or 'plate'. The Old French word entered Middle English (e.g. 'balaunce'), became modern English 'balance'; from this 'balanced' (balance + -ed) was formed, and later the noun-forming suffix '-ness' produced 'balancedness'.

Initially connected to the physical object 'a pair of scales' or the idea of two-sided weighing, the meaning shifted toward 'even distribution, symmetry, or stability' and now denotes the state of being balanced.