observational

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

These studies were observational, which differs from research done on drugs to study intended effects.

From The Wall Street Journal • May 21, 2026

To explore the connection, researchers carried out a prospective observational study at Fayoum University Hospital in Egypt between September 2024 and April 2025.

From Science Daily • May 20, 2026

The researchers reviewed observational studies, randomized clinical trials, and animal studies focused on repeated weight loss and regain.

From Science Daily • May 17, 2026

"The Earth’s energy imbalance has increased since its observational record began in 1960, particularly in the past 20 years. It reached a new high in 2025."

From Barron's • Mar. 23, 2026

Both theories lack observational evidence: no one has ever seen a giant tortoise with the earth on its back, but then, no one has seen a superstring either.

From "A Brief History of Time: And Other Essays" by Stephen Hawking