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 gravity is "importance, significance.", the definition for opportune is "Suitable or convenient.", and the definition for pantomime is "Telling a story through gestures."

The definition for precept is "A general rule of action." Used in a sentence: All the students know Mrs. Brown's strict precept; no talking in class. The definition for illuminate is "to make clear.", the definition for inauspicious is "Not favorable.", and the definition for eulogy is "Speech or writing in praise of deceased."

The definition for beneficial is "Helpful." Used in a sentence: there is no doubt that eating vegetables is beneficial to one's health. The definition for benevolent is "kind, helpful.", the definition for facade is "false or superficial appearance.", and the definition for aerate is "To supply with air."

The definition for gruff is "Rough or stern in manner or speech." Used in a sentence: Heidi's grandfather was gruff, barking stern orders and hardly smiling. The definition for scamper is "to run quickly.", the definition for aerate is "To supply with air.", and the definition for straddle is "To favor opposing sides."

The definition for duplicity is "Deceptive thought, speech, or action." Used in a sentence: The life of an undercover detective is filed with necessary duplicity. The definition for manifest is "obvious.", the definition for extant is "Currently existing.", and the definition for disconcert is "To throw into confusion."