'periodically-assembled' originates from the combination of 'periodically' and 'assembled'. 'Periodically' comes from 'period', which originates from Greek 'periodos', meaning 'a way around, a cycle'. 'Assembled' comes from Old French 'assembler', meaning 'to bring together'.

'Periodically' evolved from the Greek 'periodos' through Latin 'periodus' and Old French 'periode'. 'Assembled' evolved from Old French 'assembler' to Middle English 'assemble'.

Initially, 'periodically' meant 'in cycles or intervals', and 'assembled' meant 'brought together'. The combined term retains these meanings, indicating something gathered at regular intervals.