Conscience: the ideas and feelings you have that tell you whether something you are doing is right or wrong

Each person must vote according to his or her own conscience.

The decision must be a matter of individual conscience.

guilty conscienc(=a bad feeling because you have done something wrong)It's hard to imagine how people live with a guilty conscience.

clear conscience (=the knowledge that you have done nothing wrong)We want to leave with a clear conscience,knowing we did the job right.

struggle/wrestle with your conscienceAfter a night of wrestling with his consciencehe decided to go to the police.

ease someone's consciencePeople give a few dollars to charity in order to ease their consciences.

Conscious

conscious ofnoticingthatsomethingexistsorishappeningandrealizingthatitisimportant

Teachers are increasingly conscious of the importance of the Internet.

He was suddenly conscious of everyone looking at him.

conscious (that)We are conscious that some people may not wish to work at night.

Conscientious: working hard and careful to dot hings well

He made a conscientious effort to get the work finished.

He made a conscientious decision to buy his daughter a computer

Global English

Some interesting info here on American and Non-American varieties of English  - Seems Pedro's point was a valid one!

Defence vs. Defense

Defence and defense are different spellings of the same word. Defense is preferred in American English, and defence is preferred in all other main varieties of English, including Australian, British, and Canadian English. The spelling distinction extends to most derivatives of defence/defense, includingdefences/defenses and defenceless/defenseless. But the words defensive, defensiveness, and defensivelyhave an everywhere.

Though defense is now the American spelling, it is not American in origin. The OED and Google Books reveal examples of the spelling from as long ago as the 1300s, many centuries before the United States existed. That spelling continued to appear a fraction of the time through the 19th century, when it was taken up by American writers. Today, to the chagrin of those who dislike American English, the spelling is gaining ground throughout the English-speaking world.

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