layed off, or let go.
you can put let go by the boss
I wouldn't put the reason on the job application. You can save this for the interview and only if asked for the reason why.
If you did not answer the question truthfully on your application, you can be fired.
You should put down that you were fired and state the reason for why you were fired.
application of polymer
Perhaps you should put it just like that? After all, you didn't commit any major crime which you would have to be ashamed of.
Any lie on an application is grounds for dismissal.
You would tell the truth.
I think your question is "If you've been convicted of a felony, do you have to put it on your application." The answer is, probably so. It's not uncommon for employers to do background checks. If a check reveals a felony that's NOT on your application, you WILL be fired for lying. Even if the employer learns after ten years of exceptional performance that you once committed a felony, you will be fired for lying on your application. One option: write "Will discuss in interview" on that line. Be prepared to give a brief explaination of what happened. If you learned your lesson, you may find an employer who's sympathetic. It's better than living in fear every day that you're deception is about to be discovered.
Fired or sacked
That depends on the laws of the country in which you live and what you put on your job application form. Some countries legal system's say that for minor crimes where the conviction was over 5 years ago, your conviction record terminates (the rehabilitation of offenders) and you do not have to mention it on legal documents. Thus if you made a job application after 5 years you could not be fired. However, if the 5 year period had not expired and you did not mention (if asked) the conviction when applying for the job, then you would have lied on your job application form and you can (and should) be fired for doing this.
Clay is either put into a mold and then fired, or thrown on a wheel by a potter and then fired, or hand sculpted and then fired.