"Agreement in principle" is a term used to describe a preliminary agreement or understanding reached between parties, often subject to further negotiation and agreement on specific terms. Some synonyms for this term include "preliminary agreement," "conditional agreement," "letter of intent," or "memorandum of understanding." These terms imply that while there is a general consensus or understanding between parties, further discussion, and clarification must be had before a binding agreement is finalized. Other related terms that could be used include "proposal," "offer," or "expression of interest." Understanding and using these synonyms can help to communicate more clearly the stage of negotiations and the level of commitment between parties.