'jaggedness' originates from English, specifically from the adjective 'jagged' plus the suffix '-ness', where 'jag' meant 'a sharp projection or notch'.

'jaggedness' developed from Middle English/early modern English forms: 'jag'/'jagged' (from late Middle English dialect forms such as 'jagge' or similar), and the modern noun was formed by adding the abstract noun suffix '-ness' to 'jagged'.

Initially related to a 'jag' or notch (a physical projection), over time it came to denote the general quality or state of being jagged—applied both to physical edges and to irregularity in shapes, sounds, or patterns.