The phrase "in concordance" refers to two or more things being in agreement or harmony with each other. Some synonyms for this phrase include "in accordance," "in conformity," "in harmony," "in unity," and "in agreement." These words can be used interchangeably depending on the context in which they are used. For example, "in conformity" might often be used in the context of following rules or regulations, while "in harmony" might be used more frequently in the context of music or relationships. No matter which word is used, the overall meaning remains the same: multiple things working in alignment with each other.