Definition of: Panathenaea

(pan·ath′ə·nē′ə) noun plural
Ancient Athenian festivals celebrated yearly in mid-summer, with special magnificence (the greater Panathenaea) every fifth year: held in honor of Athena, founded by Pisistratus, and said to commemorate the union of Attica under Theseus. The lesser Panathenaea, held in the other four years, were founded by Erechtheus. [<Gk. Panathēnaia (hiera) (festival of) Athena <pan, neut. of pas all + Athēnē Athena]
—Pan·ath′e·nae′an, Pan·ath′e·na′ic (-nā′ik) adjective