* Pakikipagkapwa-tao - This is the most accurate and common translation, emphasizing the interaction between people.
* Panlipunan - This means "social" and can be used in some contexts, but it's less specific to the individual-to-individual aspect.
* Pangtao - This simply means "human" and can be used to refer to interpersonal aspects, but it's less specific than "pakikipagkapwa-tao."
The best translation will depend on the specific context and the nuance you want to convey.