 ##  [Morley Rank](/index.php/morley-rank) 

  ##  [Morley Rank](https://mathlogic.quantumdictionary.io/morley-rank-0) 

  
 [![Mathematics & Logic Dictionary](/sites/default/files/styles/large/public/2026-01/Mathematics%20%26%20Logic.png.webp?itok=UhtTRPnp)](/index.php/topic-specific-dictionaries/natural-formal-sciences/mathematics-logic)

- Natural &amp; Formal Sciences -

**Mathematics &amp; Logic Dictionary**

 
Definition

An ordinal-valued rank assigned to a definable set in a complete first-order theory that measures its model-theoretic complexity by transfinite induction; used to classify and analyze stable theories.