'outdoors' originates from the combination of 'out' and 'doors', where 'out' meant 'outside' and 'doors' referred to 'entrances or exits of buildings'.

'outdoors' evolved from the Old English word 'ūt' meaning 'out' and 'duru' meaning 'door', eventually forming the modern English word 'outdoors'.

Initially, it meant 'outside the door', but over time it evolved into its current meaning of 'in the open air'.