Validation can have different meanings depending on the context in which it is used. In the psychological and emotional sense, validation refers to the recognition and acceptance of another persons internal experience as being valid. This includes acknowledging and accepting their thoughts, feelings, and experiences as legitimate and important. In a more technical or legal context, validation can refer to the act or process of making something officially or legally acceptable or approved. This could include the determination of the degree of validity of a measuring device or the verification and validation of certain documents or processes. In a broader sense, validation can also refer to the act of affirming a person, or their ideas, feelings, actions, etc., as acceptable and worthy.

In summary, validation encompasses the recognition and acceptance of another persons internal experience, the determination of the degree of validity of something, and the act of affirming a person or their ideas as acceptable and worthy. Each of these definitions highlights the importance of validation in various aspects of human interaction and decision-making.