There are various synonyms for the phrase "only one time" that are commonly used in English language. Some of the most frequently used synonyms for this phrase include "once," "singularly," "solely," "sole," "single-handedly," "uniquely," "individually," "exclusively," and "solitarily." Each of these synonyms signifies the idea of something which has happened, been done, or been experienced only one time or on a singular occasion. While these phrases may vary slightly in their connotations or implications, they all express the notion of something that is rare, distinctive or singular, and only occurs once without being repeated again.