The Spanish word 'brigada' (meaning 'brigade') traces its roots back to the Gothic word 'brikan', which meant 'to break'. This evolved into the Italian word 'briga' meaning 'to work' or 'to break', which then developed into the Italian 'brigata'. The word then passed through French as 'brigade' before being adopted into Spanish as 'brigada'. The semantic evolution from 'to break' to a military unit makes sense when you consider that military units were often used to 'break' enemy lines or resistance.

The Spanish word 'brigadier' (meaning a military rank of brigadier) is directly related to 'brigada'. Another related term is 'brigadista', which refers to a member of a brigade, particularly used in the context of volunteer workers or military volunteers.

The English word 'brigade' is a direct cognate of the Spanish 'brigada', both coming from the same French source. English also has related words like 'brigadier' and 'break' (which connects to the original Gothic 'brikan'). The word 'brigand' (meaning bandit or outlaw) is also related, originally referring to light-armed troops before taking on its current negative meaning.