There is no commonly used word in the English language that directly corresponds to the term "excusation". However, there are a few potential synonyms one could consider. First, "justification" is a suitable substitute, as it refers to providing reasons for an action or decision. Another option is "explanation", which implies clarifying a situation or offering a motive for one's behavior. Additionally, "defense" can be used in contexts where individuals are attempting to justify their actions or beliefs. While "excusation" may not have a direct counterpart, these synonyms effectively convey the notion of presenting a rationale or justification for one's conduct.