The definition for preclude is "To rule out in advance." Used in a sentence: "Having cake now will preclude dessert later," said Amber's mother. The definition for defiant is "showing bold resistance.", the definition for servile is "Fearfully submissive.", and the definition for negate is "To make invalid."

The definition for aerate is "To supply with air." Used in a sentence: Every spring, Soloman used his tiller to aerate the compact soil. The definition for catastrophic is "relating to extreme misfortune.", the definition for disdain is "Feeling of contempt.", and the definition for extol is "To praise highly."

The definition for incumbent is "Necessary as a duty or responsibility." Used in a sentence: It was incumbent on Jack to attend his father's retirement party. The definition for inflammatory is "tending to excite anger.", the definition for retroactive is "effective as of a prior time or condition.", and the definition for benefactor is "One who offers financial help."

The definition for incongruous is "Not harmonious, incompatible." Used in a sentence: Sadie's cowboy hat was incongruous with her black cocktail dress. The definition for appalling is "inspiring dismay or disgust.", the definition for revoke is "To cancel by taking back.", and the definition for elate is "To fill with joy."

The definition for colossal is "Immense, enormous." Used in a sentence: After pushing with all his might, Frank realized he could never move the colossal boulder. The definition for impenitent is "lacking remorse.", the definition for pretentious is "Making unjustified claims.", and the definition for corrective is "Intended to correct."