The definition for buffer is "Protective barrier." Used in a sentence: The dense trees acted as a buffer against the heavy rain. The definition for preclude is "to rule out in advance.", the definition for extant is "Currently existing.", and the definition for epistolary is "Contained or carried on in letters."

The definition for negate is "To make invalid." Used in a sentence: Paula negated Tiffany's argument by proving that her main premise was false. The definition for futile is "without purpose, completely ineffective.", the definition for polarize is "To break up into opposing groups.", and the definition for ecstatic is "Overwhelmingly emotional."

The definition for catastrophic is "Relating to extreme misfortune." Used in a sentence: The effects of the massive hurricane were catastrophic. The definition for buffoonery is "foolish behavior.", the definition for mediate is "To come between parties in order to reconcile.", and the definition for revoke is "To cancel by taking back."

The definition for onset is "Beginning." Used in a sentence: Crocuses bloom at the onset of spring, sometimes even before the snow melts. The definition for embellish is "to decorate.", the definition for gravity is "Importance, significance.", and the definition for benevolent is "Kind, helpful."

The definition for corroborate is "To support with evidence." Used in a sentence: "Unless you can corroborate your story, it will not be admissible in court," the attorney told his client. The definition for punctual is "on time.", the definition for antidote is "Something that relieves or counteracts.", and the definition for impenitent is "Lacking remorse."