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