Antonyms are words that have opposite meanings. The word "apnea" refers to a medical condition characterized by the temporary cessation of breathing, especially during sleep. Some possible antonyms for "apnea" might include "respiration," "breathing," "inhalation," "exhalation," "ventilation," "oxygenation," "suffocation," and "hyperventilation." These words all suggest different ways of conceptualizing the act of breathing, indicating that "apnea" is not the only possible way to think about this process. By exploring antonyms for a given word, we can expand our understanding of its meaning and the broader contexts in which it might be used.