The definition for commemorate is "To mark by a ceremony." Used in a sentence: Each year, the Franklins commemorate their anniversary by visiting the site of their first date. The definition for repel is "to resist, reject.", the definition for colossal is "Immense, enormous.", and the definition for combustion is "Act of burning."

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 surplus is "excess.", the definition for stealth is "The act of moving secretly or unnoticed.", and the definition for manifest is "Obvious."

The definition for benevolent is "Kind, helpful." Used in a sentence: Sherman revealed his benevolent side when he offered to help Carter with his homework. The definition for regale is "to amuse.", the definition for prudent is "Marked by wisdom, shrewd.", and the definition for punctual is "On time."

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 retroactive is "effective as of a prior time or condition.", the definition for moderate is "Tending toward the average.", and the definition for sociable is "Inclined to seek companionship."

The definition for promote is "To contribute to the growth or prosperity of." Used in a sentence: The promote peace, the diplomat hosted a talk between the warring nations. The definition for punctual is "on time.", the definition for scamper is "To run quickly.", and the definition for discern is "To recognize as separate as distinct."