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 stifle is "to repress or discourage.", the definition for equitable is "Fair and equal.", and the definition for incumbent is "Necessary as a duty or responsibility."

The definition for buffer is "Protective barrier." Used in a sentence: The dense trees acted as a buffer against the heavy rain. The definition for lenient is "mild or tolerant.", the definition for retroactive is "effective as of a prior time or condition.", and the definition for pallid is "Lacking color."

The definition for intricate is "Having complex and interrelated parts." Used in a sentence: The intricate poem baffled most readers with its numerous obscure metaphors. The definition for authoritarian is "favoring absolute obedience to authority.", the definition for fraud is "Trick.", and the definition for beneficial is "Helpful."

The definition for corrosive is "Bitingly sarcastic." Used in a sentence: The cruel Estella's corrosive comments made Pip cry. The definition for extant is "currently existing.", the definition for condone is "To treat as acceptable.", and the definition for implement is "To carry out or accomplish."

The definition for serenity is "Calmness." Used in a sentence: The serenity of the glassy sea soothed the sailors after the big storm. The definition for comparable is "similar, equivalent.", the definition for archaic is "Characteristic of an earlier time.", and the definition for straddle is "To favor opposing sides."