'voluntarily' originates from Latin, specifically the word 'voluntarius,' where 'voluntas' meant 'will' or 'desire.' 'Constructed' comes from Latin 'constructus,' the past participle of 'construere,' meaning 'to heap together.'

'voluntarius' transformed into the Old French word 'voluntaire,' and eventually became the modern English word 'voluntary.' 'Constructus' evolved into the Old French 'construire,' leading to the modern English 'construct.'

Initially, 'voluntarily' meant 'of one's own free will,' and 'constructed' meant 'to build or form by putting together parts.' These meanings have largely remained the same in modern usage.