In the following sentence, what type of context clue is used to help you figure out the meaning of the word aptitude? She has an aptitude, a natural ability, to figure out mathematical problems.
You know it's a definition because it provides the meaning of the word inside commas directly after the word. It's not a synonym nor an antonym because it's not one word, and it's not an inference because you're not making an educated guess about the word based on the rest of the sentence. The sentence is directly telling you what the unknown word means, so it must be a definition.
