seminal

Seminal is an English adjective with two principal senses. In biological usage, it relates to semen, the fluid ejaculated during reproduction. In a figurative sense, it describes something that is highly influential in shaping later developments.

The word derives from Latin seminalis “of seed,” from semen “seed.” It entered English in the 15th century and has long been used in medical and anatomical contexts; in modern usage it is also applied to ideas, works, or moments deemed highly influential.

In humans, semen contains spermatozoa produced in the testes and secretions from the seminal vesicles, the prostate gland, and other glands. These components combine to form semen, which is ejaculated through the urethra during ejaculation. Seminal fluid provides nutrients, protective substances, and other factors that aid the viability and mobility of sperm.

In scholarship and culture, the term “seminal” denotes work or ideas that define or mark a turning point and influence subsequent developments. A seminal paper, book, or moment is regarded as foundational or transformative. The word is common in formal writing when describing breakthroughs in science, philosophy, art, and related fields.