What type of context clue is used to determine the meaning of "somnolent" based on its opposite?

The context clue that helps determine the meaning of "somnolent" is based on its opposite, which qualifies it as an antonym. Antonyms provide a clear contrast to the word in question, allowing readers to infer its meaning through the relationship between the two words. For example, if a sentence describes someone who is energetic and alert while mentioning "somnolent," it suggests that "somnolent" means something like sleepy or drowsy, due to the opposition in meaning. Understanding antonyms enhances comprehension by helping to clarify the definition of unfamiliar words through their contrasting counterparts.