ovulation

noun

ovu·​la·​tion ˌä vyə-ˈlā-shən  ˌō- 

: the discharge of a mature ovum from the ovary

Doctors have found that a few days before ovulation, as many as 30 to 50 egg follicles have begun to mature. Normally, only one will fully ripen … and the rest are lost.

—Mary Duenwald

In principle, ovulation takes place midway through a 28-day … cycle.

—Judith N. Schwartz

Examples of ovulation in a Sentence

Recent Examples on the Web

Most researchers believe that PMS occurs after ovulation due to a dramatic fall in estrogen and progesterone levels in people who are not pregnant.3 Not every person who menstruates will experience PMS symptoms, but most people do.3 Some people may only feel mild effects of PMS. —Elizabeth Pratt, Health, 12 May 2024

Along with tracking her cycle and taking ovulation tests, Lawrence also paid closer attention to her diet, sleep, and travel schedule. —Maressa Brown, Parents, 8 May 2024

Word History

Etymology

ovule or its source, Medieval Latin ōvulum + -ation

First Known Use

1848, in the meaning defined above

Medical Definition

ovulation

noun

ovu·​la·​tion ˌäv-yə-ˈlā-shən 

also

ˌōv- 

: the discharge of a mature ovum from the ovary

The persistent high level of estrogen induces an abrupt release of luteinizing hormone from the pituitary gland, and this hormonal surge then triggers ovulation.

—Hsiu-Wei Su et al., Bioengineering & Translational Medicine