Vessel marked as public property. 5th c. B.C. Athenian Agora Excavations. Key Terms and Concepts: ASPECT FIRST AORIST SECOND AORIST (THEMATIC) SECOND AORIST (ATHEMATIC) INFINITIVES AND ASPECT THIRD PRINCIPAL PART Chapter Navigation Key Terms and Concepts The Aorist Tense Forming the First Aorist Liquid and Nasal First Aorists Thematic Second Aorist Athematic Second Aorist First and Second Aorist Infinitive Infinitive and Aspect The Third Principal Part Exercises 28 Book Nav Exercises 27 The Aorist Tense