'burglar' originates from the Anglo-Latin word 'burgulator', which was derived from the Latin 'burgus' meaning 'fortified place' and 'latro' meaning 'robber'.

'burgulator' transformed into the Old French word 'burgler', and eventually became the modern English word 'burglar'.

Initially, it meant 'a robber of a fortified place', but over time it evolved into its current meaning of 'a person who illegally enters a building to commit a crime'.