Ranch Addition is a term used to describe the addition of land to an existing ranch. The two crossword solutions for this term are ERIA (4 letters) and ERO (3 letters). ERIA is derived from the Spanish word 'eriar' which means to enclose or fence in, while ERO is derived from the Spanish word 'erar' which means to cultivate or plow. Both words are used to describe the process of adding land to an existing ranch.