principlenounmasculine/pɾĩˈsɨpiu/mediumprin·cí·pioPortuguesEnglishEspanolFrancaisDefinitionA fundamental truth or proposition serving as the foundation for a system of belief or behavior.The principle of gravity explains why objects fall.He lives by the principle of honesty.synrulelawantexceptionEtymologyDo latim 'principium'Related wordsprincipianteprincipiarprincipiado