Learner's definition of CONSCIENCE
1 : the part of the mind that makes you aware of your actions as being either morally right or wrong
[count] — usually singular
You should decide what to do according to your own conscience.
Her conscience was bothering her, so she finally told the truth.
He doesn't seem to have a conscience. [=doesn't seem to know or care about what is morally right]
I cannot do anything that is/goes against my conscience. [=that I believe is morally wrong]
After searching my conscience, I realized that I could not accept their offer.
At least now I can face him with a clear conscience. [=without guilt]
She had a guilty/troubled conscience. [=she had a feeling of guilt about something she had done]
I urged the senator to vote his conscience [=vote as he felt he should], even if it was at odds with the party line.
The issue is a matter of (individual) conscience. [=something that people must decide about according to what they believe is morally right]
I can't work for a company that has no social conscience. [=a company that does not care about important social issues]
2 [noncount] : a feeling that something you have done is morally wrong
She felt a pang/prick of conscience [=guilt] about not inviting him.
The thief must have had an attack of conscience, because he returned the wallet with nothing missing from it.
in (all/good) conscienceformal
◊ If you cannot do something in (all/good) conscience, you cannot do it because you think that it is morally wrong.
on your conscience
◊ If something is on your conscience, it makes you feel guilty.