The phrase "in harmony" refers to a state of agreement, peaceful co-existence and synchronization between multiple entities. Synonyms for "in harmony" include "in sync", "aligned", "in concert", "united", "concordant", and "in cooperation". These synonyms describe a state of being where all parties are working together towards a common goal without conflict or discord. Additionally, the word "harmony" can also refer to musical notes that are pleasing to the ears when played simultaneously. In this context, synonyms for "in harmony" include "melodious", "consonant", "in tune", "together", and "coordinated". Each of these synonyms describes a state of agreement and positivity that should be striven for in all aspects of life.