1. A region in Spain: Castilla refers to the historic region of Castile in central Spain. This region is historically divided into Castilla y León and Castilla-La Mancha, both of which are autonomous communities in Spain.
2. A type of fabric: "Castilla" can also refer to a type of fabric, usually a heavy, plain-woven fabric. This meaning is less common than the first one.
Here are some examples:
* "Viajé a Castilla y León el año pasado" (I traveled to Castile and Leon last year.)
* "La camisa está hecha de castilla" (The shirt is made of castilla fabric.)
It's important to consider the context when encountering the word "Castilla" to understand its meaning.