rationality

noun

ra·​tio·​nal·​i·​ty ˌra-shə-ˈna-lə-tē 

plural rationalities

1

: the quality or state of being rational

2

: the quality or state of being agreeable to reason : reasonableness

3

: a rational opinion, belief, or practice

—usually used in plural

Examples of rationality in a Sentence

Recent Examples on the Web

The most worrisome aspect is that striking first in these circumstances has an element of rationality. —Robert A. Pape, Chicago Tribune, 20 July 2025

Enhancing Human Rationality Computational thinking is, at its core, an enhancement of human rationality. —Nino Letteriello, Forbes.com, 18 July 2025

The rationality of purchasing the Pollio billboard has been debated since the Kentucky Center for Investigative Reporting first reported the MacKenzie Scott donation largely paid for it. —Krista Johnson, The Courier-Journal, 31 July 2025

While the moon and Uranus harmonize, rationality is overrated. —Usa Today, USA Today, 11 July 2025

Word History

First Known Use

1628, in the meaning defined at sense 1

Phrases Containing rationality

• hyper-rationality

Rhymes for rationality

• abnormality
• cardinality
• commonality
• communality
• cordiality
• corporeality
• criminality
• criticality
• functionality
• generality
• geniality
• hospitality

Kids Definition

rationality

noun

ra·​tio·​nal·​i·​ty ˌrash-ə-ˈnal-ət-ē 

: the quality or state of being rational

Medical Definition

rationality

noun

ra·​tio·​nal·​i·​ty ˌrash-ə-ˈnal-ət-ē 

plural rationalities

1

: the quality or state of being rational

2

: the quality or state of being agreeable to reason