'justly-held' originates from the English word 'justly,' which comes from the Latin word 'justus,' meaning 'fair' or 'right,' combined with 'held,' the past participle of 'hold,' from Old English 'healdan,' meaning 'to grasp or possess.'

'justly-held' evolved from the combination of 'justly' and 'held,' reflecting the idea of rightful possession or belief.

Initially, it meant 'rightfully possessed,' and this meaning has largely remained the same in modern usage.