Commensally is defined as an organism that lives in a mutually beneficial relationship with another organism. Synonyms that can be used for commensally include symbiotic, mutualistic, cooperative, peaceful, and congenial. Other synonyms for commensally may include harmonious, collaborative, advantageous, coexisting, and supportive. These words all imply a positive relationship that benefits both parties involved, showing a harmony between them. They are words that describe a harmonious relationship between two organisms, or a relationship where one organism benefits from the other without harming them. Regardless of the word used, the meaning is to describe a relationship that is mutually beneficial for both parties involved.