Find out the appropriate meaning of the given word: Etymology

Step-by-Step Explanation
To identify the appropriate meaning of the word "Etymology," we analyze its definition and the provided alternatives:

Define the word: "Etymology" is the study of the origin of words and the way in which their meanings have changed throughout history. It comes from the Greek word etymon, meaning "true sense," and logia, meaning "study of."

Evaluate the options:

Act of spying: This refers to activities like espionage or surveillance.

To free from blame: This is the definition of "exonerate" or "absolve."

Likeness of a person: This describes a portrait, resemblance, or image of an individual.

A study of the origin of words: This directly matches the linguistic definition of etymology.