The definition for periodic is "Occurring at regular intervals." Used in a sentence: The periodic innterruptions of the cuckoo clock prevented Li from concentrating. The definition for obnoxious is "highly offensive.", the definition for aesthete is "Person having or affecting sensitivity to beauty.", and the definition for negate is "To make invalid."

The definition for placebo is "An inactive substance used in medical testing." Used in a sentence: Tom, who had taken the placebo, found that his allergy symptoms did not go away. The definition for raucous is "noisy, rowdy.", the definition for inviolable is "Secure from assault of trespass.", and the definition for pallid is "Lacking color."

The definition for combustion is "Act of burning." Used in a sentence: Campers must use fire with great caution to prevent combustion of the parched brush. The definition for meticulous is "extrememly careful regarding details.", the definition for grandiose is "With an affectation of grandeur.", and the definition for precept is "A general rule of action."

The definition for hedonism is "Belief that pleasure is the sole aim of life." Used in a sentence: The hedonism of the emperoro, who spent all his time giving parties, caused his downfall. The definition for derivative is "lacking originality.", the definition for appalling is "Inspiring dismay or disgust.", and the definition for melodious is "Having a pleasing melody."

The definition for revoke is "To cancel by taking back." Used in a sentence: After Kal's father revoked his allowance, he had no money for the movies. The definition for retroactive is "effective as of a prior time or condition.", the definition for accessible is "Easy to reach or to approach.", and the definition for repentant is "Feeling regret."