There are several synonyms for the phrase "essence of time". Firstly, "temporal essence" refers to the intrinsic nature or quality of time. "Chronological being" refers to the existence and passing of time. "Epochal significance" denotes the importance or influence of a certain period in time. Additionally, "temporal pulse" refers to the rhythm or beat of time. "Temporal spirit" refers to the intangible and ethereal aspects of time. Lastly, "temporal vitalism" pertains to the idea that time is a living force, integral to all aspects of life. These various synonyms showcase the multifaceted nature and importance of time.