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 heinous is "shockingly evil.", the definition for promote is "To contribute to the growth or prosperity of.", and the definition for regale is "To amuse."

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 commemorate is "to mark by a ceremony.", the definition for archaic is "Characteristic of an earlier time.", and the definition for naive is "Lacking worldy wisdom."

The definition for implausible is "Unbelievable." Used in a sentence: Claudia's implausible excuse failed to convince her teacher. The definition for incidental is "minor.", the definition for censure is "To find fault with.", and the definition for ethical is "Conforming to accepted standards."

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 deferment is "the act of delaying.", the definition for colossal is "Immense, enormous.", and the definition for augment is "To make greater."

The definition for diffident is "Lacking self–confidence." Used in a sentence: The diffident student never raised her hand in class, even when she knew the answer. The definition for colossal is "immense, enormous.", the definition for unscrupulous is "Lacking principles.", and the definition for pathos is "Sympathetic pity."