The definition for negate is "To make invalid." Used in a sentence: Paula negated Tiffany's argument by proving that her main premise was false. The definition for elate is "to fill with joy.", the definition for comprehensible is "Understandable.", and the definition for retroactive is "effective as of a prior time or condition."

The definition for derelict is "Abandoned." Used in a sentence: The derelict house was condemned as a public hazard. The definition for repel is "to resist, reject.", the definition for raucous is "Noisy, rowdy.", and the definition for disconcert is "To throw into confusion."

The definition for avian is "Relating to birds." Used in a sentence: The old man affectionately referred to pigeons as his "avian friends." The definition for revive is "to bring back to life.", the definition for mediate is "To come between parties in order to reconcile.", and the definition for moderate is "Tending toward the average."

The definition for appraise is "To evaluate the worth of." Used in a sentence: Simone, an expert in African sculpture, was asked to appraise the ambassador's collection of masks. The definition for demeanor is "behavior towards others.", the definition for flaw is "An imperfection.", and the definition for fickle is "Lacking constancy, changeable."

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 composed is "calm.", the definition for periodic is "Occurring at regular intervals.", and the definition for fragile is "Delicate."