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 periodic is "occurring at regular intervals.", the definition for preclude is "To rule out in advance.", and the definition for disconcert is "To throw into confusion."

The definition for stern is "Harsh, severe." Used in a sentence: The stern principal canceled the prom after the seniors played a silly prank. The definition for frugal is "thrifty, cheap.", the definition for intricate is "Having complex and interrelated parts.", and the definition for elate is "To fill with joy."

The definition for accommodate is "To give consideration to." Used in a sentence: The hospitable couple was happy to accommodate the needs of their finicky guest. The definition for negate is "to make invalid.", the definition for refurbish is "To brighten or freshen.", and the definition for stealth is "The act of moving secretly or unnoticed."

The definition for flaunt is "To display showily." Used in a sentence: Sheila, who could not resist bragging, flaunted the "A" marked on her test paper. The definition for appraise is "to evaluate the worth of.", the definition for benevolent is "Kind, helpful.", and the definition for flagrant is "Noticeably offensive."

The definition for pretense is "False intention or purpose." Used in a sentence: The jewel thief entered the mansion under the pretense of fixing a leaky faucet. The definition for perception is "capacity for seeing or understanding.", the definition for liability is "A person or thing whose presence or behavior is likely to cause embarrassment or put one at a disadvantage.", and the definition for punctual is "On time."