Invalidate/ɪnˈvælɪdeɪt/ Definition 1 of 3Pro Tip 1/3Power Loss Use 'invalidate' when someone loses authority or influence due to actions or events. The scandal will likely invalidate the politician's influence. Pro Tip 2/3Not Just Legal 'Invalidate' can be used in everyday situations, not just official or legal contexts. Ignoring her advice may invalidate your friendship. Pro Tip 3/3Perceived Validity Invalidate implies that something was once valid, but is no longer considered so. The new data invalidated the old scientific conclusions.