The definition for retroactive is "effective as of a prior time or condition." Used in a sentence: The retroactive law made even past infractions punishable. The definition for avian is "relating to birds.", the definition for duplicity is "Deceptive thought, speech, or action.", and the definition for mediate is "To come between parties in order to reconcile."

The definition for illuminate is "To make clear." Used in a sentence: Her excellent lecture illuminated the complicated subject of nuclear physics. The definition for polarize is "to break up into opposing groups.", the definition for prudent is "Marked by wisdom, shrewd.", and the definition for servile is "Fearfully submissive."

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 melee is "A tumultuous fight among several people.", and the definition for gruff is "Rough or stern in manner or speech."

The definition for celebrated is "Widely known, respected." Used in a sentence: The fans waited for hours to catch a glimpse of the celebrated actress. The definition for obnoxious is "highly offensive.", the definition for extol is "To praise highly.", and the definition for deferment is "The act of delaying."

The definition for rhapsody is "State of great happiness." Used in a sentence: Lorraine was in rhapsody when she was accepte to the college of her dreams. The definition for clarity is "clearness.", the definition for gruff is "Rough or stern in manner or speech.", and the definition for mundane is "Practical, ordinary."