first occurrence

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.

“If the radiologist had carefully reviewed both breast mammograms at the first occurrence, I would have skipped the lumpectomy and radiation and gone straight for bilateral mastectomies.”

From The Wall Street Journal • May 4, 2026

Federal biologists on Thursday confirmed the presence of a lethal fungus known as white-nose syndrome in Washington, the first occurrence in western North America of the disease that has killed roughly 7 million bats.

From Los Angeles Times • Oct. 31, 2024

Also alarming was the California Fivespined Ips beetle’s first occurrence in Western Washington.

From Seattle Times • May 19, 2024

Those studied were at increased risk for cardiovascular disease and were taking aspirin to prevent the first occurrence of a heart attack or stroke.

From Science Daily • Feb. 27, 2024

St. Thomas himself has left three treatises on chemical subjects, and it is said that the first occurrence of the word amalgam can be traced to one of these treatises.

From The Popes and Science The History of the Papal Relations to Science During the Middle Ages and Down to Our Own Time by Walsh, James J.