| astrogate | (verb) navigate in space | - |
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| (verb) guide in interplanetary travel | - |
| nitrogenise | (verb) treat with nitrogen or a nitrogen compound | Synonyms: nitrify, nitrogenize |
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| nitrogenize | (verb) treat with nitrogen or a nitrogen compound | Synonyms: nitrify, nitrogenise |
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| retrograde | (verb) get worse or fall back to a previous condition | Synonyms: regress, retrogress |
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| (verb) go back over | Synonyms: hash over, rehash |
| (verb) move back | Synonyms: retreat |
| (verb) move in a direction contrary to the usual one | - |
| (verb) move backward in an orbit, of celestial bodies | - |
| retrogress | (verb) go back to bad behavior | Synonyms: fall back, lapse, recidivate, regress, relapse |
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| (verb) get worse or fall back to a previous condition | Synonyms: regress, retrograde |