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 flagrant is "noticeably offensive.", the definition for catastrophic is "Relating to extreme misfortune.", and the definition for negate is "To make invalid."

The definition for nurture is "To further the development of." Used in a sentence: Our cat made a nest of blankets to nurture her newborn kittens. The definition for straddle is "to favor opposing sides.", the definition for periodic is "Occurring at regular intervals.", and the definition for incongruous is "Not harmonious, incompatible."

The definition for avian is "Relating to birds." Used in a sentence: The old man affectionately referred to pigeons as his "avian friends." The definition for incisive is "impressively direct and decisive.", the definition for futile is "Without purpose, completely ineffective.", and the definition for meticulous is "Extrememly careful regarding details."

The definition for untenable is "Not able to be defended." Used in a sentence: Rashid made the untenable statement that George Washington was the second president of the United States. The definition for stifle is "to repress or discourage.", the definition for corrosive is "Bitingly sarcastic.", and the definition for elate is "To fill with joy."

The definition for insolence is "Boldness or rudeness." Used in a sentence: The boy's insolence to the policeman embarrassed his mother. The definition for extant is "currently existing.", the definition for derivative is "Lacking originality.", and the definition for raucous is "Noisy, rowdy."