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 redouble is "to make twice as great.", the definition for incisive is "Impressively direct and decisive.", and the definition for serenity is "Calmness."

The definition for corroborate is "To support with evidence." Used in a sentence: "Unless you can corroborate your story, it will not be admissible in court," the attorney told his client. The definition for dubious is "questionable.", the definition for heed is "To pay attention to.", and the definition for indecorous is "In bad taste."

The definition for rancorous is "Marked by deep ill–will." Used in a sentence: The rancorous competition between the two chess clubs actually ended in a brawl. The definition for equitable is "fair and equal.", the definition for solace is "Source of consolation.", and the definition for incumbent is "Necessary as a duty or responsibility."

The definition for polarize is "To break up into opposing groups." Used in a sentence: Thelma tended to polarize discussions rather than to encourage compromise. The definition for egotist is "self–important person.", the definition for raucous is "Noisy, rowdy.", and the definition for exalt is "To elevate by praise."

The definition for abate is "Become less in amount or intensity." Used in a sentence: Just when it seemed the rain would never stop, the storm suddenly began to abate. The definition for egotist is "self–important person.", the definition for raspy is "rough, grating.", and the definition for combustion is "Act of burning."