Semelfactively

Semelfactively is an adverb that describes an action or event that occurs only once. It is derived from the Latin word "semel," meaning "once." This term is often used in academic or scientific contexts to distinguish singular occurrences from repeated or cyclical events. For example, a semelparous organism is one that reproduces only once in its lifetime. In contrast, iteroparity refers to organisms that reproduce multiple times. The concept of semelfactivity emphasizes the unique and non-repeatable nature of an event. It is not a commonly used word in everyday language, but it provides a precise way to describe phenomena that happen a single time. The opposite of semelfactively is iteropositively or repetitively.