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 rehash is "to discuss again.", the definition for antidote is "Something that relieves or counteracts.", and the definition for extant is "Currently existing."

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 antidote is "something that relieves or counteracts.", the definition for belated is "Past the normal or proper time.", and the definition for genial is "Sympathetic, friendly."

The definition for mediate is "To come between parties in order to reconcile." Used in a sentence: The diplomatic Henry was able to mediate between the quarreling sisters. The definition for elate is "to fill with joy.", the definition for dubious is "Questionable.", and the definition for melee is "A tumultuous fight among several people."

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 comprehensible is "understandable.", the definition for redouble is "To make twice as great.", and the definition for demean is "To lower status."

The definition for incumbent is "Necessary as a duty or responsibility." Used in a sentence: It was incumbent on Jack to attend his father's retirement party. The definition for unscrupulous is "lacking principles.", the definition for authoritarian is "Favoring absolute obedience to authority.", and the definition for egotist is "Self–important person."