| Subject | English | Thesaurus |
| abbr. | And Where Can I Get One | AWCIGO (Alex Lilo) |
| slang | nail that one | nail it (suburbian) |
| abbr. | one-dimensional path sensitization | linear path sensitization (ssn) |
| abbr. | one-dimensional path sensitization | single path sensitization (ssn) |
| abbr. | One legged man in an ass kicking contest | working towards an unachievable goal (ilyas_levashov) |
| mil., abbr. | One Man Army | OMA |
| abbr. | One-Man Control | OMC |
| sport., abbr. | One Man Crew | OMC |
| mus., abbr. | One Man Jam Guitar | OMJ |
| law, abbr. | One Man Klan | OMK |
| abbr., scottish | One Man Operated | OMO |
| abbr., nautic. | One Man Operated Ships | OMBO (Marinade) |
| ed., abbr. | one-room schoolhouse | ORS |
| abbr., slang | One True Pairing | otp (Meaning the your favorite combination of characters in a fandom. Arwena) |
| abbr., slang | The anticipation one feels when waiting for a response to a text message. | Textpectation (Пример: "I just texted her for a date – but now the textpectation is killing me." Franka_LV) |
| mil., abbr. | War Without End, Part One | WWE1 |