| OCT | any isomeric saturated hydrocarbon found in petroleum and used as a fuel and solvent |
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| OCT | a measure of the antiknock properties of gasoline |
| OCT | a measure of the antiknock properties of gasoline |
| OCT | a dicarboxylic acid found in cork |
| OCT | of or relating to or shaped like an octagon |
| OCT | the constellation that includes the southern celestial pole |
| OCT | a measuring instrument for measuring angles to a celestial body |
| OCT | a rhythmic group of eight lines of verse |
| OCT | a musical interval of eight tones |
| OCT | a feast day and the seven days following it |
| OCT | Roman statesman who became emperor of Rome after defeating Mark Antony at Actium (63 BC - AD 14) |
| OCT | the size of a book whose pages are made by folding a sheet of paper three times to form eight leaves |