Look up 4o in Wiktionary, the free dictionary.
4O or 4-O may refer to:
- 4° (also 4o), an abbreviation for Quarto
- 4 Degrees and Beyond International Climate Conference, discussing issues involving a 4 °C rise in average global surface temperature
- 4o Sector, see Quaternary sector of the economy
- 4O, IATA code for Interjet
- 4º, abbreviation for fourth
- 4º Supermag Rally Italia Sardinia, see 2007 Rally d'Italia Sardegna
See also
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