Definitions

1. noun

A four-part musical composition; A four-part medical condition, especially a congenital heart defect consisting of four anatomical abnormalities.

“The composer wrote a famous tetralogy for orchestra.”

2. noun

A four-part literary or dramatic work, especially a tetralogy of plays.

“The author’s tetralogy of novels explored themes of love and loss.”

3. noun

A four-part structure or system.

“The city’s tetralogy of government, economy, education, and healthcare systems worked together seamlessly.”