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 retroactive is "effective as of a prior time or condition.", the definition for buffer is "Protective barrier.", and the definition for adversary is "One who opposes or resists."

The definition for diffident is "Lacking self–confidence." Used in a sentence: The diffident student never raised her hand in class, even when she knew the answer. The definition for oblivious is "lacking awareness.", the definition for inviolable is "Secure from assault of trespass.", and the definition for melodious is "Having a pleasing melody."

The definition for genial is "Sympathetic, friendly." Used in a sentence: The genial host warmly greeted his many guests. The definition for beneficial is "helpful.", the definition for onset is "Beginning.", and the definition for incisive is "Impressively direct and decisive."

The definition for corrosive is "Bitingly sarcastic." Used in a sentence: The cruel Estella's corrosive comments made Pip cry. The definition for procrastinate is "to put off intentionally.", the definition for diffident is "Lacking self–confidence.", and the definition for revive is "To bring back to life."

The definition for scapegoat is "Someone who bears the blame for others." Used in a sentence: Audrey used her innocent baby brother as a scapegoat for the missing cookies. The definition for aesthete is "person having or affecting sensitivity to beauty.", the definition for rancorous is "Marked by deep ill–will.", and the definition for camaraderie is "Spirit of friendship."