"At last" is an expression that is used to indicate that something has finally occurred or that someone has finally arrived at a desired destination. There are several synonyms that can be used in place of "at last" to convey the same meaning. One such synonym is "finally," which can be used to indicate the end of a long process or waiting period. Another synonym is "eventually," which implies that something may have taken longer than expected but has finally happened. Other synonyms include "ultimately," "in the end," "at long last," and "after a while." All of these terms convey a sense of relief or accomplishment when used in the appropriate context.