The phrase "on one side" is a common expression used to indicate that something is limited to only one perspective or viewpoint. Some synonyms for this phrase include "from one angle," "from one point of view," "from one aspect," and "on one hand." These synonyms all imply that there is another alternative or opposing viewpoint that should also be considered. Other synonyms that could be used to express a similar meaning in different contexts include "in isolation," "unilaterally," "exclusively," and "solely." By using different synonyms for "on one side," writers and speakers can vary their language and avoid repetition in their communication.