substance

The Spanish word 'constancia' does not directly translate to 'substance' in English. It instead has a variety of meanings depending on the context in which it's used. In most cases, 'constancia' signifies persistence, constancy, or consistency. For example, it might be used to describe someone's quality of being consistent in their actions or behaviour. It can also refer to a document or certificate that proves the reality of a certain event or fact.