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 demean is "to lower status.", the definition for scamper is "To run quickly.", and the definition for heed is "To pay attention to."

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 pantomime is "telling a story through gestures.", the definition for placebo is "An inactive substance used in medical testing.", and the definition for extenuating is "Partially excusing."

The definition for placebo is "An inactive substance used in medical testing." Used in a sentence: Tom, who had taken the placebo, found that his allergy symptoms did not go away. The definition for perception is "capacity for seeing or understanding.", the definition for parity is "Equality.", and the definition for heed is "To pay attention to."

The definition for sociable is "Inclined to seek companionship." Used in a sentence: The sociable Glenda was delighted to receive the party invitation. The definition for euphoria is "feeling of great happiness.", the definition for fickle is "Lacking constancy, changeable.", and the definition for onset is "Beginning."

The definition for facade is "false or superficial appearance." Used in a sentence: Emily's smile is just a facade masking her broken heart. The definition for augment is "to make greater.", the definition for camaraderie is "Spirit of friendship.", and the definition for exasperation is "The state of being irritated."