The Spanish word 'grada' meaning 'step' or 'tier' comes from the Latin word 'gradus', which meant 'step' or 'degree'. This Latin root evolved in Spanish to create both 'grada' and its related form 'grado'.

A closely related and more common Spanish word is 'grado', meaning 'degree' or 'step'. While 'grada' specifically refers to a physical step or tier (like in stadium seating), 'grado' has taken on more abstract meanings, such as a degree of temperature or a level of education.

Several English words share this Latin root, including 'grade', 'gradient', and 'gradual'. All these words maintain a connection to the original concept of steps or degrees. 'Grade' can refer to a level or degree, just like Spanish 'grado', while 'gradient' refers to the degree of slope or incline. 'Gradual' describes something that happens in steps or degrees rather than all at once.