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| Óperă f (One of the music genres that appears under Genre classification in Windows Media Player library. Based on ID3 standard tagging format for MP3 audio files. Winamp genre ID 103) | |||
| Anglais glossaire | |||
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| operational analysis | |||
| Open Process Engine For Reliable Activities | |||
| oil pollution environmental risk assessment | |||
| operational analysis | |||
| out-of-pile expulsion and reentry apparatus | |||
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| o | |||
| A powerful type of drama, where a majority of the words are solely sung. | |||
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Opera : 1 phrases, 1 sujets |
| Construction | 1 |