efectivo
cash
effect
result, consequence
+
-ivo
adjective suffix
Efectivo means cash and can be thought of as effect0 + -ivo1. Cash is the most effective0 form of payment, having an immediate effect0.
noun
- cashCash or money in the form of currencyPrefiero pagar en efectivo. // I prefer to pay in cash.
adjective
- effectiveEffective, producing the intended resultEs un método muy efectivo para aprender idiomas. // It's a very effective method for learning languages.