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 recrimination is "a retaliatory accusation.", the definition for rancorous is "Marked by deep ill–will.", and the definition for combustion is "Act of burning."

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 incongruous is "not harmonious, incompatible.", the definition for illuminate is "To make clear.", and the definition for serenity is "Calmness."

The definition for comparable is "Similar, equivalent." Used in a sentence: Helen will only accept something of comparable value for her ticket to the concert. The definition for entangle is "to involve in trouble.", the definition for prominence is "Importance.", and the definition for exception is "A case to which the rule does not apply."

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 iridescent is "having a lustrous or attractivve quality.", the definition for negate is "To make invalid.", and the definition for pretentious is "Making unjustified claims."

The definition for unscrupulous is "Lacking principles." Used in a sentence: The unscrupulous salesman was fired for lying to his customers. The definition for ethical is "conforming to accepted standards.", the definition for opportune is "Suitable or convenient.", and the definition for pantomime is "Telling a story through gestures."