The phrase "be at one" means to be in harmony or agreement with someone or something. Synonyms for this phrase include "unite," "merge," "blend," "harmonize," "coalesce," "assimilate," "integrate," "amalgamate," "converge," "unify," and "acclimate." These words all suggest a coming together of different parts or people to form a cohesive whole. Being at one with someone or something takes effort and compromise, but the end result is a peaceful and unified existence. Whether in personal relationships or in a professional setting, being at one with those around you can lead to greater success, happiness, and fulfillment.