'subdivisional' originates from the word 'subdivision', which is derived from the Latin word 'subdividere', where 'sub-' meant 'under' and 'dividere' meant 'to divide'.

'subdividere' transformed into the Old French word 'subdiviser', and eventually became the modern English word 'subdivision' through Middle English.

Initially, it meant 'to divide under', but over time it evolved into its current meaning of 'a part of a larger whole'.