Trial marriages, also known as premarital cohabitation, are a way for couples to test the waters and see if they are compatible before tying the knot. However, not everyone is familiar with this term and there are other synonyms that can be used to describe this type of arrangement. Some of the common synonyms for trial marriages include living together, test marriages, mock marriages, provisional marriages, and trial unions. Regardless of the terminology used, the concept remains the same: it is a way for couples to determine if they are truly compatible and ready for a lifetime commitment.