"At the time" refers to a specific period or moment in the past. There are several synonyms that can be used interchangeably to convey the same meaning, such as "during that time," "back then," "in those days," "in that era," "at that point," "during those years," "while this was happening," and "at that particular moment." Each of these phrases conveys a sense of time and place, bringing the reader or listener back to a specific moment in history. Choosing the right synonym can help add clarity and precision to your writing, while also evoking a particular atmosphere or sense of nostalgia.