noun
plural -sciences
the part of the mind that makes you aware of your actions as being either morally right or wrong [count]
usually singular
[noncount] :a feeling that something you have done is morally wrong
in (all/good) conscience
formal
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.