Biotime is a term that is commonly used to refer to the period of time that an organism is biologically active. However, there are various synonyms that can be used to refer to the same term. Some of the most commonly used synonyms for biotime include biological clock, circadian rhythm, life span, age, lifespan, and physiological time. These synonyms are often used interchangeably to describe the different aspects of an organism's biological activity. While biotime may be the most commonly used term to refer to this concept, the use of synonyms can help to provide a more nuanced understanding of the various factors that influence an organism's biological activity.