Describes the state of being rancid, often in relation to fats.
La rancidez del aceite de oliva es evidente después de tres meses sin usarlo.
The rancidity of the olive oil is evident after three months of not using it.
La rancidez del aceite hizo que la comida tuviera un sabor desagradable.
The rancidity of the oil made the food taste unpleasant.