Definitions
1.VerbTo feel sorry about (a thing that has or has not happened), afterthink: to wish that a thing had not happened, that something else had happened instead."He regretted his words.; I don't regret enrolling in law, but I regret not studying some Chinese."
2.VerbTo feel sorry about (any thing)."I regret that I have to do this, but I don't have a choice.; They said they regretted to inform us that the train would be late."
3.VerbTo miss; to feel the loss or absence of; to mourn.
4.NounEmotional pain on account of something done or experienced in the past, with a wish that it had been different; a looking back with dissatisfaction or with longing.
5.NounDislike; aversion.
6.NounThe amount of avoidable loss that results from choosing the wrong action.
7.NounA person invited to an event who was unable to attend, but notified the organizer of this beforehand; a nonattendee.