| OPP | American physicist who directed the project at Los Alamos that developed the first atomic bomb (1904-1967) |
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| OPP | someone who offers opposition |
| OPP | a contestant that you are matched against |
| OPP | characterized by active hostility |
| OPP | at a convenient or suitable time |
| OPP | suitable or at a time that is suitable or advantageous especially for a particular purpose |
| OPP | at an opportune time |
| OPP | timely convenience |
| OPP | taking advantage of opportunities without regard for the consequences for others |
| OPP | a person who places expediency above principle |
| OPP | taking immediate advantage, often unethically, of any circumstance of possible benefit |
| OPP | taking immediate advantage, often unethically, of any circumstance of possible benefit |