'internally-triggered' originates from the combination of 'internal' and 'triggered', where 'internal' comes from Latin 'internus' meaning 'inside' and 'triggered' from 'trigger', which is derived from Dutch 'trekken' meaning 'to pull'.

'Internal' evolved from Latin 'internus' through Old French 'internel', while 'trigger' evolved from Dutch 'trekken' to Middle English 'triggere'.

Initially, 'internal' meant 'inside', and 'trigger' meant 'to pull', but together they evolved to mean 'initiated from within'.