'annotational' originates from Latin, specifically the word 'annotatio' (from 'annotare'), where the prefix 'ad-' meant 'to' or 'toward' and 'notare' meant 'to mark' or 'to note'.

'annotational' changed from the Medieval Latin word 'annotatio' and the Middle English word 'annotation' and eventually became the modern English adjective formed by adding the suffix '-al' to 'annotation' to create 'annotational'.

Initially, it meant 'an act of noting or adding a note', but over time it evolved into its current adjectival meaning of 'relating to or serving as an annotation'.