The definition for avian is "Relating to birds." Used in a sentence: The old man affectionately referred to pigeons as his "avian friends." The definition for celebrated is "widely known, respected.", the definition for penurious is "Extrememly stingy.", and the definition for heinous is "Shockingly evil."

The definition for retroactive is "effective as of a prior time or condition." Used in a sentence: The retroactive law made even past infractions punishable. The definition for turpitude is "essential baseness, depravity.", the definition for revive is "To bring back to life.", and the definition for nurture is "To further the development of."

The definition for untenable is "Not able to be defended." Used in a sentence: Rashid made the untenable statement that George Washington was the second president of the United States. The definition for equitable is "fair and equal.", the definition for incidental is "Minor.", and the definition for refurbish is "To brighten or freshen."

The definition for elusive is "Hard to grasp." Used in a sentence: The words to the song are elusive, as the singer tends to mumble. The definition for combative is "eager to fight.", the definition for illuminate is "To make clear.", and the definition for solace is "Source of consolation."

The definition for epistolary is "Contained or carried on in letters." Used in a sentence: The shoebox filled with letters was the ony remains of Ming's epistolary friendship with Emile. The definition for demeanor is "behavior towards others.", the definition for conduit is "Means for transmitting or distributing.", and the definition for mediate is "To come between parties in order to reconcile."