The Spanish word 'rédito', meaning 'revenue' or 'interest', comes from the Latin word 'reditus', which meant 'return' or 'revenue'. The Latin 'reditus' itself was formed from two parts: the prefix 'red-' meaning 'back' or 'again', and the verb 'ire' meaning 'to go'. So literally, the original concept was about money or value that 'goes back' or 'returns' to the owner, which evolved into the modern meaning of revenue or interest earned on investments.

Some related Spanish words include 'renta' (rent, income) and 'rendir' (to yield, produce), which share a similar conceptual background of returns or yields, though they developed from different Latin roots. The prefix 're-' in Spanish, as seen in many words like 'regresar' (to return) and 'repetir' (to repeat), comes from the same Latin 'red-' prefix found in 'rédito'.

While English doesn't have a direct cognate of 'rédito', we can see related concepts in words like 'return' and 'revenue'. The word 'rent' is also conceptually similar, though it comes from a different Latin root. The prefix 're-' in English words like 'return', 'repeat', and 'revert' comes from the same Latin prefix 'red-' that we see in 'rédito'.