—v.t. 1. to feel sorrow or remorse for (an act, fault, disappointment, etc.): He no sooner spoke than he regretted it. 2. to think of with a sense of loss: to regret one's vanished youth.
—n. 1. a sense of loss, disappointment, dissatisfaction, etc.
2. a feeling of sorrow or remorse for a fault, act, loss, disappointment, etc.
3. regrets,a polite, usually formal refusal of an invitation: I sent her my regrets. 4. a note expressing regret at one's inability to accept an invitation: I have had four acceptances and one regret.