This is the 16652nd most frequent Russian word.
сессий
"Сессий" is the genitive plural form of "сессия," meaning "sessions" or "terms" in English.
In this sentence, 'сессий' refers to academic examination sessions, which are periods when students take exams.
У студентов началась подготовка к сессиям.
Students have started preparation for their examination sessions.
Here, 'сессий' signifies sections or parts of a conference dedicated to specific subjects.
На конференции будет несколько сессий по различным темам.
The conference will feature several sessions on different topics.
In this usage, 'сессий' pertains to the individual occurrences of users accessing the system.