Definitions for regretrɪˈgrɛt

Random House Webster's College Dictionary

re•gretrɪˈgrɛt(v.; n.)-gret•ted, -gret•ting

(v.t.)to feel sorrow or remorse for (an act, fault, disappointment, etc.).
to think of with a sense of loss.
(n.)a sense of loss, disappointment, dissatisfaction, etc.
a feeling of sorrow or remorse for a fault, act, loss, etc.
regrets, a polite, usu. formal refusal of an invitation.

Origin of regret:

1300–50; ME regretten (v.) < MF regreter, OF

re•gret′ter(n.)

Princeton's WordNet

sorrow, regret, rue, ruefulness(verb)
sadness associated with some wrong done or some disappointment
"he drank to drown his sorrows"; "he wrote a note expressing his regret"; "to his rue, the error cost him the game"
repent, regret, rue(verb)
feel remorse for; feel sorry for; be contrite about
regret(verb)
feel sad about the loss or absence of
regret(verb)
decline formally or politely
"I regret I can't come to the party"
regret(verb)
express with regret
"I regret to say that you did not gain admission to Harvard"

Kernerman English Learner's Dictionary

regret(noun)ɪˈgrɛt
a feeling of disappointment or guilt about sth you did or did not do
Throughout the trial he has shown no regret.; My biggest regret is that I never apologized to her.
regret(verb)ɪˈgrɛt
to feel regret
Do you regret not taking the job?; Did he say he regretted the killings?

Wiktionary

regret(Noun)
The instance of such an emotion.
regret(Verb)
To feel sorry about (a thing that has happened), afterthink: to wish that a thing had not happened, that something else had happened instead.
He regretted his words.
regret(Verb)
To feel sorry about (any thing).
I regret that I have to do this, but I don't have a choice.

Origin: From regretten, from regreter, regrater, from re- + , , from Old , and Old , from greutanan, from ghrew-, equivalent to . Cognate with grazan, grætan, greotan, gráta, 03320342033403440330033D. More at greet.

Webster Dictionary

Regret(u)
pain of mind 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; grief; sorrow; especially, a mourning on account of the loss of some joy, advantage, or satisfaction
Regret(u)
dislike; aversion
Regret(verb)
to experience regret on account of; to lose or miss with a sense of regret; to feel sorrow or dissatisfaction on account of (the happening or the loss of something); as, to regret an error; to regret lost opportunities or friends