Abscondence refers to the act of leaving secretly and escaping without notice, but there are several alternative words that have similar meanings. One of these is "flight," which refers to a sudden and rapid departure from a certain place. Another synonym for abscondence is "fugitive," which suggests running away in order to evade punishment or capture. "Elopement," on the other hand, typically refers to the act of running away from a marriage or a romantic relationship. And finally, "decamping" is another synonym for abscondence, meaning to depart quickly and unexpectedly from a place. Each of these words has its own nuances and connotations that can add shades of meaning to the act of leaving without notice.