The definition for opportune is "Suitable or convenient." Used in a sentence: Quan stepped onto the platform at the most opportune time, just as the train pulled in. The definition for placebo is "an inactive substance used in medical testing.", the definition for trove is "Valuable collection.", and the definition for retroactive is "effective as of a prior time or condition."

The definition for scapegoat is "Someone who bears the blame for others." Used in a sentence: Audrey used her innocent baby brother as a scapegoat for the missing cookies. The definition for pretense is "false intention or purpose.", the definition for diffident is "Lacking self–confidence.", and the definition for turmoil is "Extreme confusion, agitation."

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 archaic is "characteristic of an earlier time.", the definition for manifest is "Obvious.", and the definition for egotist is "Self–important person."

The definition for discern is "To recognize as separate as distinct." Used in a sentence: The pastry connoisseur was able to discern Swiss from Belgian chocolate. The definition for elate is "to fill with joy.", the definition for mundane is "Practical, ordinary.", and the definition for fragile is "Delicate."

The definition for extol is "To praise highly." Used in a sentence: The statesman extolled the ambassador who single–handedly negotiated the peace treaty. The definition for prominence is "importance.", the definition for finite is "Having definite limits.", and the definition for opportune is "Suitable or convenient."