Depends on the reason for you being out of work! I actually prefer to use the word "let go," then explain *why* you were. They frequently call your past employers to see if you actually work there, and why you were let go, so it's best to tell the truth. Just spin it as positively as you can, and you'll be OK. Good luck! <3
On a job application the best way to say you were fired or laid off is by saying you were dismissed for being absent from your work station for a number of days without immediate permission from your supervisor.