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 discern is "to recognize as separate as distinct.", the definition for retroactive is "effective as of a prior time or condition.", and the definition for epistolary is "Contained or carried on in letters."

The definition for authoritarian is "Favoring absolute obedience to authority." Used in a sentence: Marco's authoritarian mother never allowed him to watch more than one hour of television a day. The definition for hedonism is "belief that pleasure is the sole aim of life.", the definition for rancorous is "Marked by deep ill–will.", and the definition for entangle is "To involve in trouble."

The definition for heed is "To pay attention to." Used in a sentence: "Heed my advice," the fortuneteller warned Sebastian when he tried to ignore her prophecy. The definition for avian is "relating to birds.", the definition for ethical is "Conforming to accepted standards.", and the definition for egotist is "Self–important person."

The definition for incisive is "Impressively direct and decisive." Used in a sentence: Samir's incisive leadership made him the natural choice for president of the company. The definition for onset is "beginning.", the definition for regale is "To amuse.", and the definition for pathos is "Sympathetic pity."

The definition for revive is "To bring back to life." Used in a sentence: Hank tried to revive Clare's interest in the project, but her enthusiasm had expired. The definition for incumbent is "necessary as a duty or responsibility.", the definition for absolve is "To forgive; to free from guilt.", and the definition for flagrant is "Noticeably offensive."