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 apathetic is "showing little or no emotion.", the definition for placebo is "An inactive substance used in medical testing.", and the definition for flaw is "An imperfection."

The definition for clarity is "Clearness." Used in a sentence: The refreshing water in the mountain stream was remarkable for its clarity. The definition for diffident is "lacking self–confidence.", the definition for pathos is "Sympathetic pity.", and the definition for incisive is "Impressively direct and decisive."

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 trove is "valuable collection.", the definition for penurious is "Extrememly stingy.", and the definition for implausible is "Unbelievable."

The definition for benevolent is "Kind, helpful." Used in a sentence: Sherman revealed his benevolent side when he offered to help Carter with his homework. The definition for augment is "to make greater.", the definition for trove is "Valuable collection.", and the definition for garish is "Offensively bright."

The definition for periodic is "Occurring at regular intervals." Used in a sentence: The periodic innterruptions of the cuckoo clock prevented Li from concentrating. The definition for moderate is "tending toward the average.", the definition for polarize is "To break up into opposing groups.", and the definition for extant is "Currently existing."