'occasionally-shown' is a compound word formed from 'occasionally' and 'shown'. 'Occasionally' originates from Latin, specifically the word 'occasio', meaning 'a happening or opportunity'. 'Shown' is the past participle of 'show', which comes from Old English 'sceawian', meaning 'to look at or see'.

'Occasionally' evolved from the Latin 'occasio' through Old French 'occasion', while 'shown' evolved from Old English 'sceawian'.

Initially, 'occasionally' meant 'a happening or opportunity', and 'shown' meant 'to look at or see'. Together, they convey the idea of something being revealed at irregular intervals.