What is the Spanish word for “to sign”?

The Spanish word for "to sign" is "firmar." This term specifically refers to the action of writing one's signature to endorse a document or signify agreement. When learning a language, it's important to understand that not all synonyms or related words carry the same connotation or use case.

In this context, "escribir" means "to write," which is a broader term that encompasses all forms of writing, not specifically related to signing. "Sello" translates to "seal" or "stamp," which does not pertain to the act of signing a document. Lastly, "marcar" can mean "to mark," which might be related but does not directly mean "to sign."

Understanding the precise definitions of these words helps in accurately conveying actions and intentions in both written and spoken communication.