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|Look up opt, opt out, or opt-out in Wiktionary, the free dictionary.|
Opt or OPT may refer to:
- /opt, a directory in the Filesystem Hierarchy Standard
- Option key, a modifier key on Apple keyboards
- Optimal page replacement algorithm, one of the page replacement algorithms for swapping out pages from memory
- Occupied Palestinian Territories
- Optional Practical Training, a temporary employment authorization for F-1 students
- Optimized Production Technology, a production planning system created by Eliyahu M. Goldratt
- Optimum Population Trust, former name of the UK charity Population Matters which tackles overpopulation
- Opt-out, to avoid receiving unsolicited product or service information
- Opting out, a political expression in Canada, describing the intention of a province to remove itself from a program administered by the federal government
- Opt in email, the option to receive bulk e-mail
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