This is the 602nd most frequent Spanish word.
causa
Cause.
'Causa' is used here as a noun meaning 'cause' or 'reason'.
La causa del accidente fue el exceso de velocidad.
The cause of the accident was excessive speed.
'Causa' is used here as a noun meaning 'cause' in the sense of a goal or principle pursued.
Ella siempre defiende causas justas y nobles.
She always defends just and noble causes.
'Causa' is used here as a verb in the third-person singular form of 'causar', which means 'to cause'.